Instance Mangement in simple word Maintain the Instances of Service.
generally in WCF have 3 types of instance modes are availbale
Percall : Every client call creates a new instance for service whether service
calls from same proxy(same machine) or different proxy
persession : The client gets same instance for same authentication until the service dispose. Different client gets different instances ....but the instance will be same for particular client for session......
this concept like asp.net session .
Single : Instance will be created only when service get first call....and then other clients use the same instance for futher uses