Roller Hockey is a form of hockey

Hockey

Hockey is a family of sports in which two teams play against each other by trying to maneuver a ball or a puck into the opponent's goal using a hockey stick.-Etymology:...

 played on a dry surface using skates with wheels. The term "Roller Hockey" is often used interchangeably to refer to two variant forms chiefly differentiated by the type of skate used. There is traditional "Roller Hockey," played with quad roller skates

Roller skates

Roller skates are devices worn on the feet to enable the wearer to roll along on wheels. A first basic type of roller skate consists of a boot with four wheels with ball bearings, arranged in the same configuration as the wheels of a typical car.-History:...

, and "Inline Hockey

Inline hockey

Inline hockey, often referred to as roller hockey in the United States, is a sport similar to ice hockey but played with inline skates. Like its parent sport, skaters on two teams use hockey sticks to direct a disk-shaped puck into the opponent's goal; however, various details of the game, such as...

", played with inline skates

Inline skates

In-line skates are a type of roller skate used for inline skating. Unlike quad skates, which have two front and two rear wheels, inline skates have two, three, four, or five wheels arranged in a single line...

. Combined, roller hockey is played in nearly 60 countries worldwide.
Roller Hockey played on Quad skates and Roller Hockey played on Inline skates have different rules and equipment, and they involve different types of skating but share the name Roller Hockey.