Yes.
"The teacher asked if I finished my homework, and I replied yep."
Yes.
"Yep, I will be there on time."
Initialism of Yorkshire Evening Post.
"The census taker recorded Mr. Yep as a resident of the new housing development."
A surname, from Cantonese.
Yep originated as a clipped version of yeah, spoken with the final sound cut off by snapping the lips shut. This informal word entered English alongside similar terms like yup and nope.