Robot mode is the form that Transformers have outside of their alternate mode. Although generally a bipedal humanoid in shape, the robot mode is not always so. Prominent examples include the Mini-Cassettes with animal based forms, as the cassette would be considered their alternate mode, while the "beast mode" would be considered their robot mode.
Generally speaking robot mode provides greater freedom of movement and better combat capabilities (though this can also be said of alternate modes which are designed for combat). Often, the alternate mode will be given or taken to better facilitate the robot mode, such as repair (which is what Teletraan I did with the Autobots and Decepticons aboard the Ark) or for protecting the robot mode. After taking an alternate mode, the robot mode will often display characteristics of the alternate mode.
| This page uses content from Teletraan I: The Transformers Wiki. The original article was at Robot mode.