The Imperial Lambda Shuttle is short distance craft that is used by the Galactic Empire to transport personnel between crafts or down to a planet. It was seen at the beginning of star Wars VI - Return of the Jedi transporting Emperor Palpatine from a Star Destroyer to the Death Star. It doesn`t have weapons, instead it relies on T.I.E. Fighter to accompany it for protection.
A captured Lambda Shuttle was used by the Rebellion to get a small rebel force down to the Moon of Endor so that it could destroy the generators creating the shield that protects the Death Star. The Lambda craft was piloted by Han Solo and Chewbacca and contained the main rebels including Princess Leia, Luke Skywalker, C-3PO and R2-D2 along with some non-named personnel.