Data transport in SAP

Hey,

I hope this is the right thread to ask question about SAP systems in general.

I'm transfering data from a database table into an info cube.

I learned that I need to do an extraction in my data source and then start an info package and a DTP in my BW.

At least that's how I get my data in an info cube.

The part I don't get is, what does my extraction do. I read that the info package transports the data to the PSA and the DTP handles further transport in the BW. Does the extraction transport the data to my info package?

Sry, that's a real newbie question but I want to understand how exactly my data is transfered.

Thanks,

Dominic