In most business applications, you are going to want to disable, or make invisible, different features such as menu items, buttons and other UI items, based on who is logged in and what roles or permissions they have. Angular does not have anything built-in to help you with this, so you must create it yourself. There are two different pieces to security you must worry about with Angular applications. First, you must develop the client-side security, which is the subject of this article. Second, you must secure your Web API calls, which will be the subject of another article.