A group is a

number A number is a mathematical object used to count, measure, and label. The original examples are the natural numbers 1, 2, 3, 4, and so forth. Numbers can be represented in language with number words. More universally, individual numbers c ...

of persons or things that are located, gathered, or classed together.

Groups of people

Cultural group Cultural identity is a part of a person's identity, or their self-conception and self-perception, and is related to nationality, ethnicity, religion, social class, generation, locality or any kind of social group that has its own distinct cultur ...

, a group whose members share the same cultural identity * Ethnic group, a group whose members share the same ethnic identity *

Religious group (disambiguation) Religious group may refer to: * Religious denomination, a subgroup within a religion that operates under a common name, tradition, and identity * Religious organization Religious activities generally need some infrastructure to be conducte ...

, a group whose members share the same religious identity *

Social group In the social sciences, a social group can be defined as two or more people who interact with one another, share similar characteristics, and collectively have a sense of unity. Regardless, social groups come in a myriad of sizes and varieties ...

, a group whose members share the same social identity *

Tribal group The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide usage of the term in English is in the discipline of anthropology. This definition is contested, in part due to confli ...

, a group whose members share the same tribal identity *

Organization An organization or organisation (English in the Commonwealth of Nations, Commonwealth English; American and British English spelling differences#-ise, -ize (-isation, -ization), see spelling differences), is an legal entity, entity—such as ...

, an entity that has a collective goal and is linked to an external environment *

Peer group In sociology, a peer group is both a social group and a primary group of people who have similar interests ( homophily), age, background, or social status. The members of this group are likely to influence the person's beliefs and behaviour. ...

, an entity of three or more people with similar age, ability, experience, and interest

Social science

* In-group and out-group * Primary, secondary, and reference groups *

Collectives A collective is a group of entities that share or are motivated by at least one common issue or interest, or work together to achieve a common objective. Collectives can differ from cooperatives in that they are not necessarily focused upon an ...

Science and technology

Mathematics

Group (mathematics) In mathematics, a group is a set and an operation that combines any two elements of the set to produce a third element of the set, in such a way that the operation is associative, an identity element exists and every element has an inverse. ...

, a set together with a binary operation satisfying certain algebraic conditions

Chemistry

Functional group In organic chemistry, a functional group is a substituent or moiety in a molecule that causes the molecule's characteristic chemical reactions. The same functional group will undergo the same or similar chemical reactions regardless of the re ...

, a group of atoms which provide some property to a molecule *

Group (periodic table) In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 2 and 3) are not numbered. The elements ...

, a column in the periodic table of chemical elements

Computing and the Internet

Group (computing) In computing, the term group generally refers to a grouping of users. In principle, users may belong to none, one, or many groups (although in practice some systems place limits on this.) The primary purpose of user groups is to simplify access co ...

, a collection of users or other objects * Group (database) * Group (online social networking) *

Usenet newsgroup A Usenet newsgroup is a repository usually within the Usenet system, for messages posted from users in different locations using the Internet. They are discussion groups and are not devoted to publishing news. Newsgroups are technically distin ...

Google Groups Google Groups is a service from Google that provides discussion groups for people sharing common interests. The Groups service also provides a gateway to Usenet newsgroups via a shared user interface. Google Groups became operational in Febru ...

Yahoo! Groups Yahoo! Groups was a free-to-use system of electronic mailing lists offered by Yahoo!. Prior to February 2020, Yahoo! Groups was one of the world's largest collections of online discussion boards. It allowed members to subscribe to various group ...

* Facebook groups

Other uses in science and technology

* Group (stratigraphy), in geology, consisting of formations or rock strata * Cultivar group, in biology, a classification category in the ''International Code of Nomenclature for Cultivated Plants'' *

Galaxy groups and clusters Galaxy groups and clusters are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation. They form the densest part of the large-scale structure of the Universe. In models for the grav ...

, in cosmology *

Group (firearms) In shooting sports, a shot grouping, or simply group, is the collective pattern of projectile impacts on a target from multiple consecutive shots taken in one shooting session. The ''tightness'' of the grouping (the proximity of all the shots ...

, the grouping of shots from a firearm * Language group, a unit of classification within a

Language family A language family is a group of languages related through descent from a common ''ancestral language'' or ''parental language'', called the proto-language of that family. The term "family" reflects the tree model of language origination in h ...

Other uses

Breed Groups (dog) Dog types are broad categories of domestic dogs based on form, function, or style of work, lineage, or appearance. Some may be locally adapted dog types (or ''landraces'') that may have the visual characteristics of a modern purebred dog. In c ...

, the group or category to which breeds of dogs are assigned by kennel clubs * Group (auto racing), a category of car allowed to compete in auto racing * Army group *

Militia groups A militia () is generally an army or some other fighting organization of non-professional soldiers, citizens of a country, or subjects of a state, who may perform military service during a time of need, as opposed to a professional force of r ...

Rebel groups Rebellion, uprising, or insurrection is a refusal of obedience or order. It refers to the open resistance against the orders of an established authority. A rebellion originates from a sentiment of indignation and disapproval of a situation and ...

Terrorist groups A number of national governments and two international organizations have created lists of organizations that they designate as terrorist. The following list of designated terrorist groups lists groups designated as terrorist by current and fo ...

Group (military unit) A group is a military unit or a military formation that is most often associated with military aviation. Air and aviation groups The terms group and wing differ significantly from one country to another, as well as between different branches ...

, an air force formation *

Corporate group A corporate group or group of companies is a collection of parent and subsidiary corporations that function as a single economic entity through a common source of control. These types of groups are often managed by an account manager. The concep ...

, a group of affiliated companies *

Group psychotherapy Group psychotherapy or group therapy is a form of psychotherapy in which one or more therapists treat a small group of clients together as a group. The term can legitimately refer to any form of psychotherapy when delivered in a group format, ...

, sometimes colloquially known as "group" * Musical ensemble