1.used for telling someone that what they have said or asked is true or correct; used when you are accepting what someone offers you; used when you are giving permission; used when you are agreeing to do something
2.used for asking someone what they want, for example in a store. “Yes” can sound impolite if it is expressed as a question
1.an answer that expresses agreement or that gives permission
2.a vote that shows that someone wants something or agrees with it