The Outline app helps keep your communications private by encrypting them until they reach the host’s WEPN home server.
By encrypting your information in-transit, network onlookers on it can’t decrypt and see what websites you are visiting or what information is being transferred.
Please note that you are implicitly trusting your WEPN provider. With some technical effort, they can, in theory, monitor your traffic. Please ensure you trust your WEPN provider before using their connection.