The core interface of Google Wave resembles a standard e-mail box with some tweaks. The most important part of the interface is the right box, which shows the conversations, dubbed "waves" by Google. These conversation can have multiple participants, who all have the ability to edit the conversation at any time, with each user seeing a live feed of what each participant is doing within that feed.
The middle box shows the list of conversations which are either in progress or have been conducted in the past. User icons on the left show the individual wave's participants, and the small green badges show which users are online.