What are contractions in language?

                                         Some Standard Contractions in English

aren't	are not
can't	cannot
couldn't	could not
didn't	did not
doesn't	does not
don't	do not
hadn't	had not
hasn't	has not
haven't	have not
he'd	he had; he would
he'll	he will; he shall
he's	he is;
I'd	I had; I would
I'll	I will; I shall
I'm	I am
I've	I have
isn't	is not
it's	it is; it has
let's	let us
she'd	she had; she would
mustn't	must not
she'll	she will; she shall
she's	she is; she has
need not	needn't
shouldn't	should not
that's	that is; that has
there's	there is; there has
they'd	they had; they would
they'll	they will; they shall
they're	they are
they've	they have
we'd	we had; we would
we're	we are
we've	we have
weren't	were not
what'll	what will; what shall
what're	what are
what's	what is; what has
what've	what have
where's	where is; where has
who'd	who had; who would
who'll	who will; who shall
who're	who are
who's	who is; who has
who've	who have
won't	will not
wouldn't	would not
you'd	you had; you would
you'll	you will; you shall
you're	you are
you've	you have