The application is used for video chatting and it has a great success because you don't need a very powerful Internet connection in order to have fluent movement and decent quality sound. The servers are optimized for a crystal clear image and audio quality.
You will need a username and a password to access the service, but this is obtainable from the main website of the application. Simply download the application, install it using the on-screen instructions, log-in with your details and browse the active directory and find people to chat with. For a greater experience, a webcam is recommended.