Everyone knows what a tent is, of course: a collapsible shelter of fabric stretched over and supported by pillars. This definition is fine, as far as it goes, but tents designed for different purposes are very different in characteristics. A military tent, for example, differs significantly from the recreation tent. You can check this useful reference to get detailed information about recreational tents.
For most people, when they think about the tents, it is this last image that comes to mind. Recreational tents can allow one to nine people to sleep comfortably in it.
Most modern tents actually have two layers of fabric. The outer layer is waterproof and called flysheet or rain fly. This layer is suspended above and away from the inner lining of the hood: alike set allows condensation to collect on the inside of the flysheet without risk to the inner tent.
In the camp are usually not waterproof, such as the use of leaflets prevent this need. However, there are some tents that use only one layer, and for this waterproof and breathable material used.
In addition to basic shelter from the tent, there are plenty of other parts and pieces that need to be considered. Some of them, such as stakes, have not really changed since the invention of the tent. Others, such as the vestibule, is an innovation that provides a covered outside the entrance to the tent where the equipment can be stored.
There are also innumerable tent accessories that can be purchased at any outdoor equipment store. Some, such as reading lamps attached to the tent pole, designed to create a more civilized living in tents, while others, such as floor savers, designed to improve the durability of this tent. But none of this variety seems to prevent campers in the Northwest of equipment their tents with blue tarps.