Android: Few Extra Pounds (ROM,Kernel)

Every computing device is the combination of Hardware and Software. Android is an Operating System (software).

The Android Setup :

1. Installing (Flashing) Kernel:
   What: Kernel was available as a file (~7 MB) in various formats (.elf,.img).
   Why: To controll the hardware(processor speed etc.)
   How:
            i.  Download flashtool (~110 MB) to your PC or Mac.
            ii. Connect your device to PC in fastboot or flash mode.
            iii. Flash the downloaded Kernel file (.elf or .img)
   
2. Installing (Flashing) ROM:
   What: .zip or .ftf package (~500 MB).
   Why: Contains all the files as an Operating System.
   How:
            i.  Copy the downloaded Zip file to phone memory.
            ii. Boot in to recovery to flash the Zip file.
            or
            i.  Download flash tool and connect your device in fastboot or flash mode.
            ii. Flash the downloaded .ftf file.

Prerequisites: Root phone, Install Recovery software, Refer your phone manufacturer's website to know about connecting your device to PC in fastboot or flash mode.

V. Important: Every distinct phone has distinct ROM. Every distinct ROM has distinct Kernel.
For example if you install the ROM or Kernel made for Xperia Tipo in Xperia U, your phone will be bricked(won't work).

P.S.  If you are not aware of any of the above terms, I have a search bar for my blog !