What is the difference between L2 roaming and L3 roaming as regards wireless LAN?

if clients maintains its same ip address as it roams between APs, it undergoes L2 roaming. also called Autonomous APs, a client roamsby moving its associations from one Ap to another. Autonomous roaming occurs only @ L2

while

if a client roams between APs located in different subnet, it undergoes L3 roaming, also referred to as LAPs. itmoves from WLC-WLC, according to AP-WLC binding. LAPs support both L2/L3 roaming.