Certified Ethical Hacker / CEH is sponsored and organized by the EC-Council and their goal is to certify those who have proven their competence in the area of ethical hacking. The Certified Ethical Hacker / CEH credential is a vendor neutral certification.
Certified Ethical Hacker / CEH holders must demonstrate they understand the common ways of exploiting system vulnerabilities, weaknesses and countermeasures. The EC-Council wants to define the legal role of ethical hacking and its legitimate role in enterprise organizations.
To obtain this Certified Ethical Hacker / CEH certification, you must pass a test of 50 questions covering these 21 domains:

• Ethics and Legal Issues
• Footprinting
• Scanning
• Enumeration
• System Hacking
• Trojans and Backdoors
• Sniffers
• Denial of Service
• Social Engineering
• Session Hijacking
• Hacking Web Servers
• Web Application Vulnerabilities
• Web Based Password Cracking Techniques
• SQL Injection
• Hacking Wireless Networks
• Virus and Worms
• Hacking Novell
• Hacking Linux
• IDS, Firewalls, and Honeypots
• Buffer Overflows
• Cryptography

Basically, ethical hackers are employed or contracted by a business to run penetration tests on the business network. They typically work together in groups known as Red Teams and attempt to hack into your network just as any non-ethical hacker might.

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