vocabulary - What is the difference between “within” and “inside”?

Here is the definition of the word within from Oxford Dictionary:

inside (something)

So does that mean the two words have no difference, and can be used exchangingly? Is there any connotation that one word can be used but not the other?

Answer

Inside may be used while describing position/location as opposed to outside. Example: The box is blue colored inside and black outside.

Within may be used for time/space. Example: I'll reach there within ten minutes. Stay within the boundaries.