AVR-GCC file output structure

I already searched the web, especially the avr-gcc website. I want to know the STRUCTURE of the output file, of sourcecode, compiled with avr-gcc.

Example of a standard Microsoft .EXE file:

00h     DW  Signature word.
            "N" is low-order byte.
            "E" is high-order byte.
02h     DB  Version number of the linker.
03h     DB  Revision number of the linker.

Can someone please tell me the avr-gcc output file structure?

Thank you. -MW

edit:

As Rev1.0 said, it's the Intel-HEX format.