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. The very first step in getting to recovery mode is turning off your device.
2. Wait about 10 seconds and start pressing and holding power button with volume down button.
3. As soon as you will see LG logo on your screen, you can let go of the buttons.
4. After a short moment you will be in recovery mode, congratulations!
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.