Which type of knot is commonly used to create a fixed loop at the end of a rope?

The bowline knot is widely recognized for its ability to create a fixed loop at the end of a rope, which makes it an invaluable tool in various rigging and lifting scenarios. This knot is particularly favored because it is easy to tie and untie, even after bearing heavy loads. The structure of the bowline, featuring a secured loop with a straightforward pathway for the working end, ensures that the loop maintains its shape and does not slip under pressure. This characteristic is essential in applications where reliability is critical, such as securing a load or creating a stable attachment point for lifting equipment.

While the figure-eight knot is also a popular choice for creating loops, it is more often used in climbing and rescue operations due to its ease of identification and security when under load, but it does not inherently provide a fixed loop akin to the bowline. The clove hitch is primarily employed for binding objects and is not designed to create a permanent loop. The sheet bend is useful for joining two ropes of different diameters but does not serve the purpose of creating a fixed loop at the end of a single rope like the bowline does. Thus, the bowline stands out as the optimal choice for the specific requirement of forming a fixed loop.