What is the difference between "it's" and "its"?

[Miriam]

Common Errors in English, Advanced Level

ESL/EFL Test #11 "Adjectives and Verbs", question 3

From it's very beginning the piece of music has the power to carry you away to distant lands.

(a) it's
(b) beginning
(c) carry
(d) distant

Common Errors in English, Advanced Level

ESL/EFL Test #11 "Adjectives and Verbs", answer 3

From its very beginning the piece of music has the power to carry you away to distant lands.

Correct entry: its
The error was: (a) it's

You have found the error but your entry is incorrect.
From it very beginning the piece of music has the power to carry you away to distant lands.
_________________________

What different between it and it's?

Thanks
Miriam

[Conchita]

It is a pronoun referring to a thing, animal or situation.

It's is a contracted form of it is or it has (pronoun + verb).

Its is a possessive adjective and means belonging to it.