Question Mark (?) - A question mark, as its name suggests, needs to go at the end of every interrogative sentence instead of a full stop.
For example: How old are you?
1, Do you remember what I told you about yesterday?

Exclamation Mark (!) - An exclamation mark added at the end of a sentence shows emphasis. Depending on the meaning of the sentence, it can indicate anger, happiness, excitement, or any other strong emotion.
1. example: Leave me alone!
2. I’m so happy to see you!