--- description: Hacking is identifying and exploiting weaknesses in computer systems and/or computer networks. Ethical hacking is about improving the security of computer systems. title: What is Hacking in Cyber Security? image: https://www.guru99.com/images/what-is-hacking-an-introduction.png --- [Skip to content](#main) **⚡ Smart Summary** Hacking in cyber security means identifying and exploiting weaknesses in computer systems or networks. This tutorial defines hacking, explains who hackers are, classifies the major hacker types, and contrasts malicious hacking with ethical hacking that strengthens defenses lawfully. * 🔑 **Core Definition:** Hacking is finding and exploiting weaknesses in systems or networks to gain access. * 🎩 **Hacker Types:** Hackers are classified by intent — white hat, black hat, grey hat, script kiddie, hacktivist, and phreaker. * 🛡️ **Ethical Hacking:** White-hat hacking is legal when done with written permission to fix weaknesses. * ⚖️ **Cybercrime:** Using computers for illegal acts such as fraud, identity theft, and denial-of-service attacks. * 🤖 **AI Enablement:** AI now powers threat detection, automated penetration testing, and faster vulnerability analysis. [ Read More ](javascript:void%280%29;) ![What is Hacking in Cyber Security?]() ## What is Hacking? **Hacking** is the activity of identifying weaknesses in a computer system or network and exploiting that security gap to gain access to personal or business data. An example of computer hacking is using a password-cracking algorithm to gain access to a system. Computers have become essential to running successful businesses. It is not enough to have isolated computer systems; they must be networked to communicate with external businesses, which exposes them to the outside world and to hacking. Malicious system hacking uses computers to commit fraudulent acts such as fraud, privacy invasion, and the theft of corporate or personal data. Cybercrime costs many organizations millions of dollars every year, so businesses must protect themselves against such attacks. Before we explore hacking further, let us look at who hackers are and the most commonly used terminology in the field. ## Who is a Hacker? A **Hacker** is a person who finds and exploits weaknesses in computer systems and/or networks to gain access. Hackers are usually skilled computer programmers with knowledge of computer security. ## Types of Hackers Hackers are classified according to the intent behind their actions. The table below lists the main types of hackers by intent. | Type | Description | | --------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [](https://www.guru99.com/images/EthicalHacking/img1.png) | **Ethical Hacker (White hat):** A security hacker who gains access to systems in order to fix the identified weaknesses. They may also perform [penetration testing](https://www.guru99.com/learn-penetration-testing.html) and vulnerability assessments. | | [](https://www.guru99.com/images/EthicalHacking/img2.jpg) | **Cracker (Black hat):** A hacker who gains unauthorized access to systems for personal gain. The intent is usually to steal corporate data, violate privacy rights, or transfer funds from bank accounts. | | [](https://www.guru99.com/images/EthicalHacking/img3.jpg) | **Grey hat:** A hacker who sits between ethical and black-hat hackers. They break into systems without authority to identify weaknesses and reveal them to the system owner. | | [](https://www.guru99.com/images/EthicalHacking/img4.jpg) | **Script kiddie:** A non-skilled person who gains access to systems using ready-made tools created by others. | | [](https://www.guru99.com/images/EthicalHacking/img5.jpg) | **Hacktivist:** A hacker who uses hacking to send social, religious, or political messages, usually by hijacking websites and leaving a message on the hijacked site. | | [](https://www.guru99.com/images/EthicalHacking/img6.png) | **Phreaker:** A hacker who identifies and exploits weaknesses in telephone systems instead of computers. | ## What is Ethical Hacking? Ethical hacking is the practice of identifying weaknesses in computer systems and/or networks and developing countermeasures that protect against those weaknesses. Ethical hackers must abide by the following rules. * Get **written permission** from the owner of the computer system or network before hacking. * **Protect the privacy** of the organization being assessed. * **Transparently report** all identified weaknesses to the organization. * **Inform** hardware and software vendors of the identified weaknesses. ### RELATED ARTICLES * [Top 100+ Cyber Security Interview Questions and Answers ](https://www.guru99.com/cyber-security-interview-questions.html "Top 100+ Cyber Security Interview Questions and Answers") * [What is Digital Forensics? History & Process ](https://www.guru99.com/digital-forensics.html "What is Digital Forensics? History & Process") * [9 Best Free Mobile Phone Tracker App for GPS Location \[2026\] ](https://www.guru99.com/free-mobile-phone-tracker-apps.html "9 Best Free Mobile Phone Tracker App for GPS Location [2026]") * [How to Access Dark Web Safely? ](https://www.guru99.com/access-dark-web-safely.html "How to Access Dark Web Safely?") ## Why Ethical Hacking? * Information is one of the most valuable assets of an organization. Keeping it secure protects the organization’s image and saves money. * Fake or malicious hacking can cause loss of business for organizations that handle finance, such as PayPal. Ethical hacking keeps them a step ahead of the cybercriminals who would otherwise cause that loss. ## Legality of Ethical Hacking **Ethical hacking is legal as long as the hacker abides by the rules defined in the section above.** The [International Council of E-Commerce Consultants (EC-Council)](http://www.eccouncil.org/) provides a certification program that tests an individual’s skills. Those who pass the examination are awarded certificates, which must be renewed periodically. ## What is Cyber Crime? [Cybercrime](https://www.guru99.com/cybercrime-types-tools-examples.html) is the use of computers and networks to perform illegal activities such as spreading computer viruses, online bullying, and unauthorized electronic fund transfers. Most cybercrime is committed through the internet, and some is performed using mobile phones via SMS and online chatting applications. ## Types of Cybercrime The following list presents common types of cybercrime. * **Computer Fraud:** Intentional deception for personal gain through computer systems. * **Privacy violation:** Exposing personal information such as email addresses, phone numbers, and account details on social media or by hacking a website. * **Identity Theft:** Stealing someone’s personal information and impersonating that person. * **Sharing copyrighted files:** Distributing copyright-protected files such as eBooks and computer programs. * **Electronic funds transfer:** Gaining unauthorized access to bank [computer networks](https://www.guru99.com/types-of-computer-network.html) and making illegal fund transfers. * **Electronic money laundering:** Using a computer to launder money. * **ATM Fraud:** Intercepting ATM card details such as account and PIN numbers and using them to withdraw funds. * **Denial of Service Attacks:** Using computers in multiple locations to overwhelm servers and shut them down. * **Spam:** Sending unsolicited emails that usually contain advertisements. ## FAQs ⚡ What is the difference between hacking and ethical hacking? Hacking exploits system weaknesses, often for malicious gain. Ethical hacking finds the same weaknesses with the owner’s written permission in order to fix them, making it a legal, defensive practice. 🎩 What are the main types of hackers? The main types are white hat (ethical), black hat (malicious), grey hat (in between), script kiddie (uses ready-made tools), hacktivist (sends a message), and phreaker (targets telephone systems). ⚖️ Is ethical hacking legal? Yes, when the hacker has written permission from the system owner, protects privacy, and reports all findings. Hacking without authorization is illegal regardless of intent. 🆚 What is the difference between a white hat and a black hat hacker? A white hat hacker works legally with permission to fix weaknesses, while a black hat hacker accesses systems without authorization for personal gain. Their technical skills overlap; intent and consent set them apart. 📜 What certification is needed for ethical hacking? The Certified Ethical Hacker (CEH) credential from the EC-Council is the most recognized. Other respected options include CompTIA Security+, OSCP, and various [cyber security courses](https://www.guru99.com/cyber-security-certifications-courses.html). 🔍 What is the difference between hacking and cybercrime? Hacking is a technique for accessing systems and can be legal or illegal. Cybercrime is any illegal act committed using computers, such as fraud or identity theft. Malicious hacking is one form of cybercrime. 🤖 How is AI used in cyber security and ethical hacking? AI strengthens defenses by detecting anomalies, automating vulnerability scans, and prioritizing risks. Ethical hackers use AI to speed up reconnaissance and reporting, helping organizations fix weaknesses faster. 🧠 Can AI make cyber attacks harder to defend against? Yes. Attackers can use AI to craft convincing phishing and scale attacks, which is why defenders increasingly rely on AI-driven monitoring, employee awareness training, and layered security to stay protected. #### Summarize this post with: ChatGPT Perplexity Grok Google AI **Stay Updated on AI** **Get Weekly AI Skills, Trends, Actionable Advice.** ##### Sign up for the newsletter Subscribe for Free You have successfully subscribed. 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