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.
2. Now press and hold Power button with Volume Down button.
3. Now when you see LG logo, release the keys before the logo disapears.
4. Now you will enter recovery mode screen.
5. Congratulations! now to switch between option use volume keys and to proceed use power button.
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.