Gapps are Google apps and services that are packaged together. Gapps include apps like Play store, Talk, Now, etc. You are required to flash Gapps while installing a custom ROMs. Custom ROMs usually do not contain gapps and they have to be flashed a later stage. Gapps can be downloaded from www.goo.im, but these packages are outdated as Google has rolled out updates for all of it’s Gapps.
So here is a packaged Gapps which are updated to the latest version and also applied many useful MODs.