Recovery, in Android, refers to the bootable partition, in which the recovery console is installed.
It contains tools to help repair your installations as well as install official OS updates by using a combination of key presses or instructions from a command line sometimes.
Android is open, meaning the recovery source code is available, so that building a customized ROM is relatively easy.
1. For a start take your phone and hold down your power button to shut it down.
2. When your phone is turned off you have to press and hold both Volume down button and power button at the same time.
3. When you will see LG logo on your screen you can release those buttons.
4. Once you did this there should apppear hard reset screen, similary looking like this:
5. And this is it, your device is in recovery mode.
All Android phones come with built-in recovery mode that is separate from the original operating system.
The recovery mode is used to access different features of the phone without accessing the phone’s OS.
The main function of the recovery mode is to fix the phone while staying away from the faulty OS of the phone.