When a class member includes a static modifier,the member is called as static member.When no static modifier is present the member is called non-static or instance member.
Static members are invoked using class name where as instance members are invoked using instances(objects) of the class.
An instance member belongs to specific instance(object) of a class.If we create three objects of a class we have three sets of instance members in the memory, where as there will ever be only one copy of the static member,no matter how many instances of a class are created.