Imagine you have a big box where you keep all your toys. Sometimes a toy may get a scratch or break, so you have to fix it, right?
Well, a database is like a big box where a computer keeps all its information. Sometimes, the computer can't find the information it needs because something got mixed up or broken. That's when we need to do a database repair.
Just like when you fix a broken toy, a grown-up has to look at the database and find out what's wrong. They may have to move some information to the right place or remove some bad data. And just like how you have to be gentle when fixing a toy, they have to be careful not to mess up any other information while they're fixing the database.
When the repair is done, the database is like a box of toys that's all in order again, with no broken toys or missing pieces. Then the computer can find what it needs when it wants to show you some information or do some work.