Search Vs. Filter- what is the difference

From the view of the user (not from a technical view)- What are the main differences between searching and filtering data, in order to get specific results?

i.e.- in both cases the user is looking for specific data so why should he care which method is used to find it?...

would you say these two methods are mostly the same (in the eyes of the user)?

If not- when would you use each?