D-sub, D-shaped connectors, or D-subs, are a type of electrical connector that is named for their D-shaped metal shell. They are commonly used in computer and networking applications, as well as in a variety of other electronic systems. D-sub connectors typically have multiple parallel rows of pins or sockets that are used to make connections between different circuits or components. They may also include a ground shield or other features to improve their performance and reliability. D-sub connectors are available in a range of sizes and configurations, and can be used with a variety of different conductor sizes and materials.