Web role
The web role provides all web endpoints like the web site, the web services and the internal security token service
The web role provides the following web endpoints
InfoShareAuthorwhich is the SDL LiveContent Architect Web ClientInfoShareWSwhich hosts all web servicesInfoShareSTSwhich is the internal security token service
Since the Web role is required on every SDL LiveContent Architect installation, an out-of-the-box SDL LiveContent Architect installation will enable all web endpoints.
The Web role is used to serve external clients, but it is also used to serve the internal roles like the Translation role and the Default background task role. When it is used for external web endpoints, the Web role can be scaled out via Network Load Balancing (NLB).