ROM = Read Only Memory
This type of memory is non volatile (not power dependent), it can not be changed using normal methods i.e written to like RAM. ROMS are used widely for any application that requires data to be stored permanently and/or without a constant supply of power.
Basically, as far as you need to know, a ROM is an image of a game, which, obviously, you need to play that game. Do not ask for games (ROMS) here, as you will be immediately banned, and not get the answer to your question.
He wasnt asking for ROMS, he just got confused, thats all. Then again, tehre are way too many people that ask for them and dont even read the code of Conduct before agreeing