A barrel connector is a type of electrical connector commonly used to supply power to various devices. It typically consists of a cylindrical metal barrel and a central pin, allowing for a secure connection. These connectors are often found in power adapters for electronics like laptops and cameras, providing a simple way to connect and disconnect power. Barrel connectors come in various sizes and configurations, making them versatile for different applications. They are usually categorized by their outer diameter and inner pin size, which ensures compatibility with specific devices. This standardization helps users easily find the right connector for their needs.