A swing is a hanging seat, usually found in a playground for children, a circus for acrobats, or on a porch for relaxing. The seat of a swing can be attached to a chain or a rope. Once a swing is in motion it continues to oscillate like a pendulum until external interference or drag brings it to a halt.

On playgrounds , several swings are often suspended from the same metal or wooden frame, known as a swing set, allowing more than one child to play at a time. Such swings come in a variety of sizes and shapes. For infants and toddlers, swings with leg holes support the child in an upright position while a parent or sibling pushes the child to get a swinging motion. Some swing sets include play items other than swings - such as a rope ladder or sliding pole.

For older children, swings are sometimes made of a flexible canvas seat , of rubberized ventilated tire tread, of plastic, or of wood. A common backyard sight is of a wooden plank suspended on both sides by ropes from a tree branch. Older children can go much higher, sometimes over 15 feet (5 m) above the ground. In the United States, some adults go to the extreme and compete in the N.S.A, "National Swing Association", where competitors reach heights over 20 feet, while leaping at the peak of their swing.

Tire swings are a form of swing made from a whole tire. These are often simply a new or used tire hanging from a tree on a rope. On commercially developed playground swingsets, oversized new tires are often reinforced with a circular metal bar to improve safety and are hung on chains from metal or wooden beams. They may hang vertically or hang flat, suspended from three of more points on one side. These flat type of swings can hold three or more children. Pumping is achieved by using one or two of the three chains attached to the swing, and two (or more) children can pump in turn. Tire swings can also be used in spinners, where the occupants use their feet to propel the tire. Children find ways of performing dangerous stunts on tire swings, and because of this, many have been removed from schools and parks.

Natural swings may be created by lianas (creeper plant) in a subtropical wild forest like Aokigahara forest near Mount Fuji.
A rope swing is a swing created by tying one end of a length of rope to a tree branch, bridge, or other elevated structure. A knot or loop is usually put on the other end to prevent fraying and help the swinger stay on. Rope swings are often situated so that those swinging on them can let go and land in water deep enough to cushion the fall and to be swum around in. Many other dangerous/unusual stunts can be done using 1 or more rope swings. This is the most dangerous type of swing.
The incorporation of a short board such as a skateboard in which the rider stands is called Swing boarding. The Sport of Swing boarding is made safer by the use of an attached board and a harness for the rider.

A toddler swing is a swing with a half bucket shape and a buckle to allow toddlers to climb into or out of the swing on their own.

A porch swing is a garden seat that has sun protection on top, and can swing like a swing. The seat will give place to about three adults.