Very Basic Question: How does Homebrew Work

Okay, I have a PSP and NDS, and I have much experience with my modded psp and it's custom firmware, but never tried anything with my NDS.

So I'm basically asking someone to some up how to activate homebrew in a few short sentences... I heard you buy something like a game cartridge and you can put homebrew and roms on it? If so, how would you put it on the cartridge?


Thanks ahead of time =)

You've got the basic idea, yes. Most adapters take microSD cards, which can connect to your computer via a card reader. Popular choices include the R4, CycloDS Evolution, Supercard DS, and DSTT.