Pin headers are small electronic connectors used to create a reliable connection between circuit boards and other components. They consist of a series of metal pins arranged in a row, which can be inserted into a matching socket or directly soldered onto a circuit board. Pin headers are commonly found in various electronic devices, including computers and Arduino boards, allowing for easy connections and disconnections. These connectors come in different sizes and configurations, such as single or double rows, and can have varying pin counts. Pin headers are essential for prototyping and building electronic projects, as they facilitate the integration of components like sensors, displays, and microcontrollers.