Heat shrink tubing is a type of plastic tube that shrinks in diameter when heated. It is commonly used to insulate electrical wires, providing protection against moisture, abrasion, and electrical shorts. The tubing comes in various sizes and colors, making it versatile for different applications. To use heat shrink tubing, you slide it over the area you want to protect and then apply heat using a heat gun or lighter. As the tubing heats up, it contracts tightly around the wire or component, creating a secure and durable seal. This makes it an essential tool in electrical work and DIY projects.