About iphone programming problems

I am a beginner iphone, his reading has many places are not really understand ... So you ask ...
What is the self?? I read and write is the application delegate, do not really understand what it meant, what it can be???
There
Often appear below in writing and the navigator, select the like:
# Pragma mark Table Data Source Methods
/ / ...
# Pragma mark Table Delegate Methods
/ / ...
I ask about the content of the above two written is called at what time?? (Written inside method)

Thank you answer people .....
Reply:
No one answered @ @ @ ...
Reply:
self is equivalent to this;

# Pragma mark Table Data Source Methods beginning of this fact, nothing special,
It is for a XCode compiler command, and before it the following code to separate it, for ease of reading.
You can see the results when the radio this separate class file.
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The reply was deleted at the moderator 2010-11-25 10:16:20

Reply:
Thank you ...