A D-subminiature connector, often referred to as a D-sub connector, is a type of electrical connector used for data and power transmission. It features a distinctive D-shaped metal shell that provides mechanical support and alignment. These connectors come in various sizes and pin configurations, making them suitable for a wide range of applications, including computers, telecommunications, and industrial equipment. D-sub connectors are commonly used in serial and parallel communication, as well as in video and audio connections. They are known for their durability and reliability, often featuring a locking mechanism to ensure a secure connection. Popular variants include DB9, DB25, and DE9 connectors.