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. Getting to Recovery Mode on your device starts from turning it OFF. If you did that go to next step.
2. Now press and hold power button with home button and volume down button, and wait few seconds.
3. After that, you will see LG logo on your screen and you can release the buttons.
4. Few seconds later your phone should boot into recovery mode, good job!
5. If you want to know how to navigate in this menu then its: Volume buttons to move up or down, power button to select option.