Which knot is used to connect two lines of near equal diameter?

The square knot is used to connect two lines of similar diameter and material, making it particularly effective for tying together two ropes of near equal thickness. This knot is designed to lay flat, which allows for easy tightening and provides a secure hold that will not slip under tension when used appropriately. It is commonly used in various applications, such as securing bundles, packages, or even in sailing for joining two ropes.

Understanding the square knot's characteristics is essential for ensuring safety and effectiveness in knot-tying situations. This knot should not be confused with knots designed for different purposes, such as the sheet bend, which is better suited for joining lines of different diameters, or knots like the figure eight and round turn with two half hitches, which serve different functions in securing or managing lines.