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. At the start power off your device using power button.
2. Second thing we have to do press and hold the Volume down key + Power key with your hand.
3. When LG logo will appear on screen release both buttons.
4. Now you will enter recovery mode screen.
5. And this is it! You have reached your destination.
Recovery is included on a separate partition from the main Android OS on all Android devices.
You can boot directly into recovery mode and use it to factory reset the device, delete the cache partition, or apply software updates.
It can help you fix your device.