An extension ladder is a type of ladder that can be adjusted in length to reach various heights. It consists of two or more sections that slide against each other, allowing the user to extend or retract the ladder as needed. Extension ladders are commonly made of materials like aluminum or fiberglass, making them lightweight yet sturdy for various tasks. These ladders are often used for tasks such as painting, roof repairs, or accessing high places. Safety features, such as rubber feet and locking mechanisms, help ensure stability while in use. Proper setup and usage are essential to prevent accidents when using an extension ladder.