developpment architecture

hello,

I must do a presentation of how to develop an iView with SAP and I was asking to explain what is the use of the different directory that are created with the wizard when we use Eclipse. Obviously, not all directory, the main only, for example, Class api, css, PORTAL-INF, jsp, pagelet, src.api and src.core

can somebody help me to define it or say where I can found it?

thanks