Metasploit Framework (The best hacking tool )

  What is Metasploit Framework ?

Metasploit software helps security and IT professionals identify security issues, verify vulnerability mitigations, and manage expert-driven security assessments, providing true security risk intelligence. Capabilities include smart exploitation, password auditing, web application scanning, and social engineering. Teams can collaborate in Metasploit and present their findings in consolidated reports.
Metasploit editions range from a free edition to professional enterprise editions, all based on the Metasploit Framework, an open source software development kit with the world's largest, public collection of quality-assured exploits.
Metasploit can help penetration test, can find vulnerability,payload,exploit etc…
(more tutorial will come soon about metasploit)

 What is a vulnerability?

A vulnerability is a security hole in a piece of software, hardware or operating system that provides a potential angle to attack the system. A vulnerability can be as simple as weak passwords or as complex as buffer overflows or SQL injection vulnerabilities.

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Official website : http://www.metasploit.com