What is correct, "It's a beautiful day" or "Its a beautiful day"?

Question : What is correct, "It's a beautiful day" or "Its a beautiful day"?

Answer : Definitely “It’s a beatiful day”. The apostrophe stands for the second “i” in “It is a beautiful day”.

The reason for the confusion here is that the normal way of indicating possession or ownership is an apostrophe - e.g. “Jim’s car,” “The boy’s hat.” These are said to be contractions of “Jim, his car” “The boy, his hat”, an old way of saying this.

This form is not applied to “It” so “The cat’s tail” would not be written “It’s tail”. It would simply be “Its tail”.