SQL injection is a type of code injection that takes advantage of security vulnerability at the database level. It's certainly not the easiest form of hacking, but if you're serious about turning a website upside down then this is the way to do it.
Take a gander at this video to learn how to hack a website with SQL injection. Examples of what you can do with SQL injection are obtaining customers' names, defacing websites, and infecting other PCs.
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