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. Lets start from turning off your device by holding down your power button.
2. Then after a moment press and hold power button combined with volume button and don't let go.
3. Wait utnill your phone displays LG logo and let go of the buttons.
4. Now your phone should be in Recovery mode menu, Congratulations!
5. IF you need to know how to navigate in this menu then it's volume buttons for moving up or down and power button to select option.
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.