EnableViewState property in webforms

Hai
What is mean of EnableViewState="false" and EnableViewState="true"
I Know EnableViewState="false" = turn Off the ViewState and also  EnableViewState="true" turn On the ViewState
But What is the working  purpose of differense in EnableViewState="false" and EnableViewState="true" ?
I Just try this code
<form runat="server"> <asp:TextBox ID="TextBox1" EnableViewState="true" runat="server"></asp:TextBox>< asp:Button ID="Button1" runat="server" Text="Button" /> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> </form> I really confucing . If  when i used EnableViewState="true&q ...