Image of a Y-Wing bomber 
The BTL-A4 Y-wing assault starfighter/bomber is a prime example of a bomber utilized by the Rebel Alliance.
Bombers, which are a type of starship, were specifically engineered for attacking targets that possessed significant armor, such as heavily shielded capital ships or fortified ground-based artillery emplacements. The majority of these vessels were outfitted with projectile-based weaponry, including proton torpedoes, proton bombs, and concussion missiles. It was even possible to employ externally attached cargo modules for conducting bombing operations.
Generally, bombers were characterized by their reduced speed and cumbersome handling, which made them susceptible to assaults from enemy starfighters. To counteract this vulnerability, they frequently depended on both escort fighters and mutual support. By maneuvering in closely knit formations, bombers could establish overlapping zones of defensive fire, providing protection for one another.