At some point in the past, someone came up with the concept of a resource . This page is a resource, this sentence is a resource, you're a resource, I'm a resource, my e-mail inbox is a resource.
Resources are the most general type of abstraction.
A resource is just something, anything . The reason is not quite clear, but it boils down to the fact that we need some way of accessing resources. The important characteristic of a resource, however, is that it is unique . If you've been using the Internet for even a short while, you'll have realized that trillions of things are accessible through it. The need for a general way to refer to things has come about.