Why does the sink’s drain pipe bend upwards before entering the wall?

Question

Why does the sink’s drain pipe bend upwards before entering the wall?

In: 16

Answer 1

It’s to trap water in the pipe so that way gasses from sewage or other nasty things don’t creep their way up into your house, iirc

Often referred to as S-traps or P-traps depending on the shape

Correct me if I’m wrong