A hunting blind is a cover device for hunters, designed to reduce the chance of detection; ground blinds are an alternative to the traditional Treestand, movements in a well-designed ground blind can virtually be undetectable by the game.
There are different types of blinds for different situations, such as deer blinds and duck blinds. Some are exceedingly simple and easy to construct, while others are quite complex.

Duck blinds in the grain fields in south central Oregon

Oregon

Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...

 and north central California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

 can be as simple as a hunter walking two or three miles out into a grain field, stopping at a dike, a raised area, two feet (60 cm) or so high, 10 or 12 feet (3.0-3.6 m) wide and usually a half mile or so long on a side. The hunter simply sits down on the top and pushes dirt away with both feet, front and back. In two to three minutes a shallow depression is created. Then additional stubble from cut grain can be placed around the edges, enough to provide cover when the hunter lies down when birds are spotted, sitting up when they come in range. The blind can be deepened to allow sitting upright by using an empty can, e.g., a coffee can, as a digging tool, much lighter to carry than a small shovel.
In other areas duck blinds can be quite elaborate. More substantial structures are common in the midwestern United States

Midwestern United States

The Midwestern United States is one of the four U.S. geographic regions defined by the United States Census Bureau, providing an official definition of the American Midwest....

 and their purpose often extends beyond concealment to include protection from the elements, particularly from rain and cold. In some areas, blinds can approach small cabins in their size and amenities. A sinkbox

Sinkbox

A sinkbox is a specialized hunting blind used by waterfowl hunters and consisting of a weighted, partially submerged enclosure large enough to hold one or more hunters and suspended from a floating platform...

 is another elaborate form of duck blind, designed for partial submersion in a body of water. They are illegal to use in the United States.

Deer blinds may not be legal in all areas so hunters are obligated to check hunting laws before constructing one. Alternatives include simply sitting still at the base of a tree. This would be legal everywhere hunting is permitted.

What may be illegal is adding to a natural condition to improve upon it and conceal a hunter's presence, or actually constructing something with sides and a roof.

In Some states, hunting from a camouflaged blind may be prohibited during rifle/shotgun season. In which case a hunter is required to add orange patch on blind such that the orange is visible from all angles.

Other simple blinds include climbing a tree, usually with special climbing equipment

Climbing equipment

A wide range of equipment is used during rock climbing. The most popular types of climbing equipment are briefly described in this article. The article on protecting a climb describes equipment commonly used to protect a climber against the consequences of a fall....

 and also with some kind of seat, or with a burlap enclosed frame. In India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

, a hunting platform on a tree during shikar is known as machan.