Roller Coasters are the pivotal rides of the franchise the big draws of any successful park. They consist of one or more trains on a track which can be freely built by the player. Depending on your scenario and research progress, you could also have access to many types of coaster technlogies designed to twist the lunch from your brave guests' guts. Most guests prefer roller coasters over all other ride types.
There is at least one standard design available for every type of roller coaster. In the build menu, hold your cursor over a design name to see its statistics and what it looks like. Other ride types, including some gentle rides and water rides, also work this way.