The Diplodus vulgaris is a coastal fish with an oval-shaped body that is relatively tall and laterally compressed. Its body is typically bright silver-grey in colour, often displaying subtle golden longitudinal lines that follow the rows of scales in fresh specimens. This species can be easily recognised by two distinct black bands: one located on the caudal peduncle (the narrow part of the body just before the tail) and another positioned behind the head, between the base of the dorsal fin and the base of the pectoral fin.

The two-banded seabream is a highly gregarious species, meaning that individuals commonly form groups or schools, particularly around rocky reefs, seagrass beds, and coastal habitats. Its relatively long fins are well suited to manoeuvring in rocky environments, where it searches for food among crevices and on the seabed. The species feeds on a variety of small benthic organisms, including crustaceans, molluscs, worms, and algae. Like many members of the seabream family, it is a hermaphroditic species, meaning individuals can change sex during their lifetime, which helps maintain balanced reproductive populations.