Roller skates

Roller skates are footwear fitted with wheels that let a wearer roll across a hard surface. Their wheels may be arranged in two parallel pairs or in a single line.

Quad roller skates: Roller skates with four wheels arranged in two parallel pairs. The two-pair layout gives these skates a broad, stable base.
Roller skating: Recreational or athletic movement on roller skates. It is the broad activity made possible by this footwear.
John Joseph Merlin: An eighteenth-century Belgian inventor and instrument maker known for an early roller skate. His wheeled footwear helped introduce the idea of skating on land.
Ice skate: A boot fitted with a blade for gliding over ice. Its blade glides on ice, while roller skate wheels roll over hard surfaces.
Roller skate wheel: A wheel designed to roll beneath a roller skate boot or frame. Wheel diameter and hardness affect speed, grip, and ride comfort.
Roller derby: A contact team sport played on roller skates around an oval track. Quad skates are widely used for the sport's tight turns and rapid stops.
Joseph Merlin's roller skate demonstration: A 1760 London performance in which Joseph Merlin reportedly skated while playing a violin. The demonstration is an early documented episode in roller skate history.
Inline skate: A skate with wheels arranged in a single line beneath the foot. Inline skates contrast with quad skates' two parallel pairs of wheels.
Roller skate bearing: A component inside a skate wheel that reduces friction as the wheel rotates. Bearings let the wheels spin freely around their axles.
Artistic roller skating: A judged sport combining skating with choreographed movements, jumps, and spins. Skate design supports the precision and edge control used in routines.

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