Runabout

In starship classification, a runabout is the designation of a type of vessel smaller than a starship but larger than a shuttlecraft. Runabouts are equipped with limited weapons and drive systems, but offer additional living space and have a larger operational range compared to shuttles, and are capable of speeds up to warp 5. Runabouts are typically assigned to space stations or starships as auxilliary craft. (DS9: "Emissary", "Paradise"; TNG: "Timescape")

The Danube-class of runabouts entered service in 2368, with many being assigned to Deep Space 9.

In an alternate timeline, the Yellowstone''-class of runabouts was introduced in 2372. It featured a tetryon plasma drive system.'' (VOY: "Non Sequitur")

Background information
It is possible that the Spacedock ferry type of craft were actually classified as runabouts. This design served as inspiration for the first design concepts of the Danube-class.