SQL Injection attacks uses form inputs in order to manipulate the SQL-server. In these kinds of attacks, the hacker may get control over the server, and thus access information that should be protected.
In order to better control and protect yourself against such attacks, it is always nice to know more about how they work. Kassaras has made a very nice How-To, where he explains in detail how you can set up a test system and then try to manipulate it.
The post is well worth a read!

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