Elluminate is a service that provides online chat/conversation using text and voice (one-to-many, many-to-many). Video interaction can also be integrated. As such, it creates a synchronous, interactive "virtual classroom" for lectures, discussions, and collaboration. However, there are many tools in E-Learning unavailable in Elluminate (e.g. gradebook, learning modules, discussions); so these two systems are complimentary resources.
For detailed information, visit e-Learning Support | Elluminate.