Cross-country skiing is a winter sport in which participants use skis to travel over snow-covered terrain. It is also known as Nordic skiing, as it originated in the Nordic countries of Europe. Skis are the primary equipment used for cross-country skiing, and they are designed to provide stability and grip on the snow. The skis are usually long and narrow, allowing for greater speed and maneuverability. Cross-country skiing is a popular recreational activity, as well as a competitive sport. It can be enjoyed by people of all ages and abilities.