What does it mean "add a Copy Files phase" to add a Framework to a project

I'm reading this answer about adding a plugin into xCode 3

Hi开发者_如何学Python, I did a few things to correct (I do not know which steps solved the problem)
1) downloaded a fresh copy
2) linked link against the framework
3) added a copy phase to include the framework into the application

What does "copy phase" mean ?

I've solved by adding the framework to the MAC OSX Library, but I would like to add it to my project instead. I've been told how to add it in xCode4, but how to add it to xCode3 ?

You get to it from here

If you want to see an example of it - have a look at this example Xcode Project on GitHub which has a Copy Files phase to copy a Framework - and also some explanation in the Readme.