Meaning of “because” - Learner’s Dictionary

because

conjunction us uk /bɪˈkɒz, bɪˈkəz/
I couldn't go because I was ill.I didn't like her because she was rude to Dan.Do remind me because I'm likely to forget.People work for them because they pay well.Two of the team weren't playing because they were injured.

A1 used to give a reason for something:

I phoned because I needed to talk to you.
I can't come out tonight because I've got too much homework.

(Definition of “because” from the Cambridge Learner’s Dictionary © Cambridge University Press)