expression
that's right; that's so
Colloquial, polite expression used to affirm or agree with what someone just said. Often used in casual conversation with a friendly tone.
A: 今日は本当に暑いですね。B: ですです。
A: It's really hot today, isn't it? B: That's right.
A: このケーキ、おいしい!B: ですです!
A: This cake is delicious! B: It sure is!