SQL Injection

Could even be his twin - that joke is from 2007, if little Bobby was in kindergarten then he'd be around 22 by now and could be trying to land his first job out of college!

Bypassing authentication or checks by incorporating a statement that always returns true, and doing an 'or' operation with the statement being injected. It manipulates the return value of the SQL statement to make it always return true, so if the website is checking if the statement returned true to indicate, for example, the password is correct, it will now think that was the case.