This is the first post, I am keeping it short for testing purposes 🙂
SharePoint Application Services provides web service endpoints for WFEs (and other
components) for connection. These end point in high available configuration require
load balancing which is available OOTB in SharePoint 2010.
This is a great reading for more information on this topic: http://blogs.msdn.com/b/dtaylor/archive/2011/02/23/sharepoint-2010-service-application-load-balancer.aspx