yes

yep is "yes" (ys) adv.
It is so; as you say or ask. Used to express affirmation, agreement, positive confirmation, or consent. n. pl. yes·es
1. An affirmative or consenting reply.
2. An affirmative vote or voter.
tr.v. yessed, yes·sing, yes·es
To give an affirmative reply to.
interj.
Used to express great satisfaction, approval, or happiness.