What are knots primarily composed of in their structure?

Knots are primarily composed of elements such as bights and loops, as this formation is essential in their structure. A bight is a term used to describe the part of the rope that curves back on itself, while a loop is created when the rope crosses over itself, forming a circular shape. Together, these elements allow a knot to secure itself by creating friction and interlocking the strands of the rope, which prevents it from coming undone under tension. Understanding the role of bights and loops is crucial for effectively tying knots, as they contribute to the strength and stability of the knot in various applications, from climbing to fishing and beyond.