What exactly does database normalization do?

Question

New to database and so no to get upset with simple questions. As far as my googled and gathered knowledge normalization reduces redundancy of data and increase the performan

Answer 1

As well as all the above, it just makes a certain sense. Say you have a user and you want to record what kind of car they have.

Put that all in one table and then you're fine, until someone owns two cars... You're then going to need two rows for that person, and a way of making sure that you can link those two rows together...

And then what if you also want to record how many dogs they have? Same table with lots of confusing dups? Another table with your own custom logic to manage unique users?

Normalization keeps you away from a lot of these problems...