Sentence explanation help

In the sentence in English: You have to find something that you like a lot

This translates to: tienes que buscar algo que te gusta mucho

How come after tienes there is a “que” there, what is its purpose?

Also in the sentence: You look for it with the clues they give you

Translates to: Lo buscas con las pistas que te dan

Why would there be a que preceding the te in this instance?