Camping is an outdoor activity involving overnight stays away from home in a shelter, such as a tent, caravan, or motorhome. It can be enjoyed through all four seasons and is a popular recreational activity among elites since the early 20th century. Modern campers frequent publicly owned natural resources, such as national and state parks, wilderness areas, and commercial campgrounds. Camping can be combined with hiking, canoeing, climbing, fishing, and hunting, and can be enjoyed in conjunction with other outdoor activities. The definition of camping varies, with survivalist campers setting off with minimal resources, while recreational vehicle travelers arrive equipped with electricity, heat, and patio furniture.