anything & everything

[To Tak Tung]

What are the differences between anything and everything at the ways of meaning and usage?

1. You can buy anything you want on the Internet.
2. You can buy everything you want on the Internet.

The first sentence is from a dictionary. But may I change to the second one? If both are correct, what are their differences?

[Tdol]

They are both correct. The first is talking about an individual purchase and the second about multiple purchases.