Snuff is a product made from ground or pulverised tobacco
Tobacco is an agricultural product processed from the leaves of plants in the genus Nicotiana. It can be consumed, used as a pesticide and, in the form of nicotine tartrate, used in some medicines...

 leaves. It is an example of smokeless tobacco
Smokeless tobacco
Smokeless Tobacco may refer to:* Dipping tobacco, a type of tobacco that is placed between the lower or upper lip and gums.* Chewing tobacco, a type of tobacco that is chewed.* Snuff, a type of tobacco that is insufflated or "snuffed" through the nose....

. It originated in the Americas and was in common use in Europe by the 17th century. In recent years because of the ban on smoking in pubs in most European Union countries, the practice of snuff taking has increased somewhat.

It is generally insufflated
Insufflation (medicine)
Insufflation is the practice of inhaling a substance. Insufflation has limited medical use, but is a common route of administration with many respiratory drugs used to treat conditions in the lungs and paranasal sinus .The technique is common for many recreational drugs and is also used for some...

 (inhaled) or "snuffed" through the nose either directly from the fingers or by using specially made "snuffing" devices.

In the English speaking world it traditionally refers to dry, fine, nasal snuff; however in Scandinavia it more often refers to snus
Snus , or Swedish snuff, is a moist powder tobacco product originated from a variant of dry snuff in the early 19th century in Sweden, consumed by placing it under the lip for extended periods of time. The precursor of snus, the dry form of snuff inhaled through the nose, was introduced in Europe...

 which is moist and somewhat coarse.