An imperative sentence typically ends with a period (full stop) or an exclamation mark (exclamation point), depending on the context and the tone of the sentence.
Period (full stop): An imperative sentence can end with a period when it conveys a straightforward command or request without a sense of urgency or strong emotion. For example:
"Please close the door."
"Pass me the salt, please."
Exclamation mark (exclamation point): An imperative sentence can end with an exclamation mark when it expresses a strong command or urgent request, or when it conveys strong emotion or emphasis. For example:
"Stop!"
"Help!"
"Don't do that!"
The choice of whether to use a period or an exclamation mark at the end of an imperative sentence depends on the speaker's intent and the desired tone of the sentence.