What format are games on a GBA cartridge?

Question

Here's what I want to do - 1) download games from the internet and play them on my GBA, 2) play short movies on my GBA.
I have bought a cartridge which holds a MiniSD flash memory card. I copied some ROMs on it, didn't work. For the movies I used a software to convert .AVI video file to .GBA file, didn't work either. Do the GBA movie players in the market use a special cartridge? Do you have to have a sort of application on the memory card, for it to be able to play the movie in the GBA? DID lots of searches, didn't find anything except commercial sites trying to sell sth.
So, how do I play any videos or games on a GBA, using a memory card?????

Answer 1

i dont know if GBA can play video....the screen quality look strange..... GBA's game is fomated in ROM.

http://www.gameboy-advance-roms.com/gameboy_advance_roms.htm
here is a list of website that have free/non-free ROM u can download.

but i dont know how u can play downloaded game using GBA. good luck!

Answer 2

.bin?