Don’t is a contraction of do not, and doesn’t is a contraction of does not.
Both Don’t and doesn’t are auxiliary verbs.
When speaking don’t is used in the first and second person plural and singular and the third person plural:
Contractions don’t can be used to make a negative statement.
I don’t like football.
You don’t have time to do homework.
We don’t finish that project jet.
They don’t need to fix that.
It can also be used when asking a question:
They want to have new car, don’t they ?
You need to call your boss, don’t you ?
When speaking in the third person singular then we use doesn’t:
Doesn’t is also used to make negative statements:
He doesn’t want me to come.
She doesn’t have money.
It doesn’t look like great.
Don’t and Doesn’t – Commands
One of the main difference between this two words is that don’t can be used to give commands but doesn’t can’t.
Don’t touch that !
Don’t make a noise !