When you were a kid and one of your siblings was annoying you, you reacted instantly. You’d yell out “Mum!” and she’d say, “just ignore them.” And no matter how much you tried, you couldn’t do it.
The same thing happens today.
Do you have someone in your life who irritates you, could be someone at work, at home, in your circle of friends etc. You try to ignore them, try to stay calm, try not to let them get to you—but they get under your skin. 
This technique removes that reaction, it teaches you how to break the pattern, clear the built-up irritation, and stop your system from automatically reacting the same way.
You can't change them; chances are they will always be annoying, but you can change how you feel when you are around them.
Use regularly to get the best results.