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Nothing is the lack or absence of anything. Colloquially, however, the term is often used to describe a particularly unimpressive thing, event, or object.

In mathematics, nothing does not have a technical meaning. It could be said that a set contains “nothing” if and only if it is the empty set, in which case its cardinality (or size) is zero. In other words, the word “nothing” is an informal term for an empty set.

In physics, the word nothing is not used in any technical sense. A region of space is called a vacuum if it does not contain any matter. But it can contain physical fields. In fact, it is practically impossible to construct a region of space which contains no matter or fields, since gravity cannot be blocked and all objects at a non-zero temperature radiate electromagnetically. However, supposing such a region existed, it would still not be “nothing”, since it has properties and a measurable existence as part of the quantum-mechanical vacuum.

In computing, the null character and the zero character are distinct; as are the blank character and the empty string; the null character and the SQL null value; and so on.

The concept of “nothing” has been studied throughout history by philosophers and theologians; many have found that careful consideration of the notion can easily lead to the logical fallacy of reification. (If one does not believe that nothing is no thing.) The understanding of “nothing” varies widely between cultures, especially between Western and Eastern cultures and philosophical traditions. For instance, emptiness, unlike “nothingness,” is considered a state of mind in Buddhism (See Nirvana, Mu, Enlightenment). Existentialism and Heidegger have brought these two understandings closer together.