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. When your phone is switched off press and hold Power button +Volume Down + Home Button.
3. Wait untill you will see LG logo on the screen and release the buttons.
4. If you did last steps correctly you should be seeing this menu on your screen.
5. Congratulations! you know now how to get to Recovery Mode.