There are mainly Two Versions of ROM (operating systems)
A stock ROM is the version of the
phone's operating system that comes with your phone when you buy it.
Where as the custom ROM is a fully standalone
version of the OS, including the kernel (which makes everything run), apps,
services, etc - everything you need to operate the device, except it's
customized by someone in some way.
Here are few screenshots of Galaxy Y with ICS JellyBean ROM
So what does the "customized"
part mean? Since Android is open source, developers are free to take stock
ROMs, modify them, optimize them, add things, and pretty much do whatever their
imagination and skills allow.



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