Cosmids are plasmids that can be packaged into capsids of the bacteriophage lambda; therefore,they can be transmitted like phages,but they can exist and replicate in a cell like plasmids.

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Cosmids are hybrid plasmids that contain the origin of replication and selection markers of a plasmid, as well as the cos site, which allows them to be packaged into a phage capsid. This means they can be transmitted like phages, but once inside a host cell, they can exist and replicate as plasmids.

Cosmids Are Plasmids That Can Be Packaged into Capsids of the Bacteriophage