If you mean the Spanish ''por'' as in the English ''for'', its για (gia).
por kay (spelt 'por que') is simply "why"; e.g. 'por que no?', "why not?"
"¿Por qué [k] no?" It means, "Why not?"
es por ti = is for you
por auto = by car
"why not?"
"¿Por qué corres?" means "Why do you run?"
por la vida= for life
"Loca por ti" means crazy for you.
Depending on context, it can mean several things. For, by, through. It is also used in many idiomatic expressions that are taken as a whole, por aqui, por favor, etc.
For always
please
if