The document discusses the ASP Session object. It explains that a session preserves data across successive user interactions with a web application by creating a unique cookie for each user that identifies them. The Session object stores user-specific variables, like name and preferences, that are available across pages in an application. It describes common Session methods like Abandon and Contents.Remove, and events like Session_OnStart and Session_OnEnd. It also covers when sessions start and end, how to change the timeout, and potential problems with relying on the Session object.