A Serial cable is a cable that can be used to transfer information between two devices using serial communication. They are similar in appearance to Parallel cables but transmit data in a single stream rather then along multiple channels. Some examples of Serial cable ends include DB-25 (25 connector pins), DB-9 (9 connector pins), and Centronics 36 (36 connector pins).
15ft DB25M TO DB9F NULL MODEM CBL
6-Foot Serial Cable: DB9 Male to DB9 Female (DB9M/DB9F), Beige
6-Foot Serial Cable: DB9 Male to DB9 Male (DB9M/DB9M)
10-Foot Serial Cable: All Lines, DB9 Female to DB9 Female (DB9F/DB9F), Black
15-Foot Serial Cable: PC/XT 25 Male to 25 Female, Straight Thru