sticky cookies

"Cookie" selected as your persistence profile is a "sticky cookie"

If your application requires a client to connect to the same server again and again then you need persistence.

For example if your app has a "shopping cart" for clients to add items to.

If you are hosting a static HTTP site, and you want perfect standard load balancing, you do not need persistence.

Hope that helps! If it does please up-vote and select this answer, it'd be greatly appreciated!

-Dylan