First of all, Mod's are a short way of saying modifications. They can edit cars, vehicles, clothes, and even buildings on the PC version of San Andreas.
To get mod's for these, you would have to go to either:
To install mod's onto the actual game after download, get the installer, SAMI, to install the mod's on the game.
Just type in SAMI gtasa mod installer into a search engine and install that to install the mods
Other types of mods like clothes and buildings are harder to install.
You need to get a script file before you can use SAMI to install it.
Most sites will provide scripts with all of the mods though, but some can be found on various forums and other sites.
Make sure that the game stayes in it's limit of KB's otherwise the game will crash.
If you have trouble on the loading screen of the game, after installing any mod, try typing this into any search engine, download it, and operate it straight after download.
"Downgrader Gta San Andreas Mod"
After using the downgrader you will have no trouble loading the game.
Hope this helped!
Added by: SanAndreaz Jun 14th 2008, ID#12696