 A snow groomer is a machine designed to smooth and compact the snow, rather than removing it altogether.Early snow groomers were used by residents of rural areas to compress the snow close to their homes, and consisted of a heavy roller hauled by oxen which compacted the snow to make a smooth surface for sledging.With the invention of the motor car, snow groomers were replaced by snowplows and snow blowers on public thoroughfares, but remained in use at ski resorts, where they are used to maintain smooth, safe trails for various wintersports, including skiing, snowboarding and snowmobiling.