What is a contraction?

A words or group of words resulting from combining or eliding an earlier form.

A contraction is a words or group of words resulting from combining or eliding an earlier form.

Some examples of this are:

I/You/He/She/It/They'd = I/You/He/She/It/They would Don't = Do not Doesn't = Does not Couldn't = Could not Wouldn't = Would not Shouldn't = Should not Needn't = Need not I'm = I am You/They're = You/They are He/She/It's = He/She/It is Ain't = have not; has not; do not; does not; did not; am not; are not; is not

And many more...