Which directive is used to register User Controls on the Page?

<Register> directive is used to register any User Controls on the Page.

To register User Control we will write below code as:-
<%@ Register TagPrefix = "uc1" TagName = "Person_Info"
Src = "~/UserControls/Person_Info.ascx" %>

<uc1:Person_Info Id = "Employees" runat = "server" />