Kiting is also known as orb walking. Basically you do auto-attack animation canceling by issuing a newer command. Typically move and attack move are issued one after another. It does no matter who is running this will result in more damage from you. Similarly you can do skill animation canceling and some champions have skills that reset AA or other skill cooldowns.
Example of skill cd is that during Riven E you can cast other skills that actually can be canceled quicker. Example of AA cooldown reset is Master Yi W - You can Yoymoo + r + e + q + AA + w + AA + Tiamat (That will hit instantly). If you think that is harsh, then you should look at Rengar - he can burst people with 3k hp and 200 def in 0.2 s out of vision (there will be no kiting).
Kiting starts to work in your favor when you have movement speed or attack range higher then enemies.
https://www.youtube.com/watch?v=prb47MkDX98
My tip for you is that learn to do this not only for adc, but every champion.