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D-Subminiature (D-sub, Sub-D, or DB) connectors are a family of electrical connectors that have a characteristic "D" shape with several contact points. The backshells, hoods, and connectors are D-shaped. However, not all D-shaped connectors are D-sub connectors; some may be RJ-45 ethernet connectors, for instance. D-sub connectors are widely used in computer and telecommunications applications, as well as in consumer electronics.

At the most basic level, a D-sub connector consists of several pins arranged in three rows; the first row has three pins, the second row has two pins, and the third row has one pin. The most common type of D-sub has 9-pins in a 9-pin configuration, but they can have up to 37 pins in a 37-pin configuration. Generally speaking, a 9-pin connector is used for analog video, a 15-pin connector is used for digital video, and a 37-pin connector is used for a variety of peripherals including keyboards and modems. The backshells, hoods, and connectors are available in various sizes and shapes.

The main purpose of a D-sub connector is to facilitate the connection of two electronic devices, such as a computer and a printer. There are both male and female connectors available; the male connector typically has pins that protrude from the connector, while the female connector typically has sockets that accept the pins of the male connector. When two connectors are mated, electrical connection is made between the pins and sockets. This is typically achieved using a metal barrel, or sleeve, which contains a forming spring that creates a secure physical and electrical connection.

The backshells, hoods, and connectors offered for D-Sub connections have several features that can improve the performance of the connection. Most commonly, the backshell provides strain relief, which prevents the possibility of disconnecting the connector due to over-stressing, while the hoods provide EMI/RFI shielding. Additionally, the molded plastic parts of the backshells and hoods provide additional protection to the connector, while the connector nibs provide additional retention force.

D-sub connectors, backshells, hoods, and connectors provide a reliable and secure connection between two electronic devices. They are easy to install and provide effective EMI/RFI shielding for cables or devices. Additionally, they offer protection against physical contact damage caused by excessive torque or pulling of the cables. Lastly, the molded parts provide enhanced retention force and strain relief that can improve the performance and reliability of the connection.

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