TTree Physical layout

I am new to ROOT.I was going through the ROOT internals.Can someone please explain what is there in the key and data portion of a TTree object like It is given incase of TFile,TKeylist in this link … /doc/TFile .


welcome to ROOT!
If you are starting with trees internals, you should start with the Users’ Guide chapter dedicated to trees … html#trees
What you can do next is to read the documentation of TKey