In this post I will be installing and configuring ADFS WAP ( Web Application Proxy)
What is ADFS Proxy
The AD FS 3.0 Proxy is a service that brokers a connection between external users and your internal AD FS 3.0 server. It acts as a reverse proxy and typically resides in your organization's perimeter network.
The Web Application Proxy (WAP) is a role service of the Remote Access server role in Windows Server 2012 R2. One of the primary roles of the WAP is to performs pre-authenticates access to web applications using Active Directory Federation Services (AD FS), and in this capacity the WAP functions as an AD FS proxy.