Is its spelled with a apostrophe?

The word "it's" is spelled with an apostrophe. It is a contraction of "it is" or "it has".

Here are some examples:

* It's a beautiful day. (contraction of "it is")

* It's been a long week. (contraction of "it has")

If you are referring to something belonging to "it", then you would use "its" without an apostrophe.

* The dog wagged its tail.