A mite is a small, often microscopic arachnid that belongs to the class Arachnida and order Acari. They are related to spiders and ticks but have distinct differences in their physical characteristics and behavior. Mites can be found in various habitats including soil, water, plants, animals, and even human environments such as bedding or clothing. Some species of mites are harmless while others can cause skin irritation or allergic reactions when they come into contact with humans. In general usage, the term "mite" is also used to refer to something very small in size or amount, similar to how we might use the word "speck."