A group is a

number A number is a mathematical object used to count, measure, and label. The most basic 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 can ...

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

Groups of people

Cultural group An ethnographic group or ethnocultural group is a group that has cultural traits that make it stand out from the larger ethnic group it is a part of. In other words, members of an ethnographic group will also consider themselves to be members of a ...

, a group whose members share the same cultural identity *

Ethnic group An ethnicity or ethnic group is a group of people with shared attributes, which they collectively believe to have, and long-term endogamy. Ethnicities share attributes like language, culture, common sets of ancestry, traditions, society, re ...

, a group whose members share the same ethnic identity * Religious group (disambiguation), a group whose members share the same religious identity *

Social group In the social sciences, a social group is 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. F ...

, a group whose members share the same social identity * Tribal group, 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. Members of peer groups are likely to influence each others' beliefs and behaviour. Durin ...

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

Class (education) A class in education has a variety of related meanings. It can be the group of students which attends a specific course or lesson at a university, school, or other educational institution, see '' Form (education)''. It can refer to a cours ...

, a group of people which attends a specific course or lesson at an educational institution

Social science

In-group and out-group In social psychology and sociology, an in-group is a social group to which a person psychologically identifies as being a member. By contrast, an out-group is a social group with which an individual does not identify. People may for example ...

* 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 e ...

Philosophy and religion

* Khandha, a Buddhist concept of five material and mental factors that take part in the rise of craving and clinging

Science and technology

Mathematics

Group (mathematics) In mathematics, a group is a Set (mathematics), set with an Binary operation, operation that combines any two elements of the set to produce a third element within the same set and the following conditions must hold: the operation is Associative ...

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

Chemistry

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

, 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 14 f-block columns, between groups 2 and 3, are not numbered. The ele ...

, a column in the periodic table of chemical elements

Computing and the Internet

* Group (computing), a collection of users or other objects *

Group (database) Group is a name service database used to store group information on Unix-like A Unix-like (sometimes referred to as UN*X, *nix or *NIX) operating system is one that behaves in a manner similar to a Unix system, although not necessarily conformi ...

Group (online social networking) A group (often termed as a community, e-group or club) is a feature in many social networking services which allows users to create, post, comment to and read from their own interest- and niche-specific forums, often within the realm of virtual co ...

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 not only discussion groups or conversations, but also a repository to publish articles, start ...

* Google Groups *

Yahoo! Groups Yahoo! Groups was a free-to-use system of Electronic mailing list, 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 s ...

Facebook groups Facebook is a social-network service website launched on February 4, 2004, by Mark Zuckerberg. The following is a list of software and technology features that can be found on the Facebook website and mobile app and are available to users of ...

Other uses in science and technology

Group (stratigraphy) In geology, a group is a lithostratigraphy, lithostratigraphic Stratigraphic unit, unit consisting of a series of related Geological formation, formations that have been classified together to form a group. Formations are the fundamental unit of ...

, in geology, consisting of formations or rock strata *

Cultivar group A Group (previously cultivar-groupInternational Code of Nomenclature for Cultivated Plants, 4th edition (1969), 5th edition (1980) and 6th edition (1995)) is a formal category in the '' International Code of Nomenclature for Cultivated Plants'' (' ...

, 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 gra ...

, 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 t ...

, 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 ancestor, called the proto-language of that family. The term ''family'' is a metaphor borrowed from biology, with the tree model used in historical linguistics ...

Other uses

Breed Groups (dog) Dog types are broad categories of domestic dogs based on form, function, 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 con ...

, the group or category to which breeds of dogs are assigned by kennel clubs *

Group (auto racing) The International Sporting Code (ISC) is a set of rules applicable to all four-wheel motorsport as governed by the Fédération Internationale de l'Automobile (FIA). It was first implemented in 1926. The ISC consists of 20 articles and several app ...

, a category of car allowed to compete in auto racing *

Army group An army group is a military organization consisting of several field army, field armies, which is self-sufficient for indefinite periods. It is usually responsible for a particular geographic area. An army group is the largest field organizatio ...

* Militia groups * Rebel groups * Terrorist groups *

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 branch ...

, an air force formation *

Corporate group A corporate group, company group or business group, also formally known as a 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 gr ...

, 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, i ...

, sometimes colloquially known as "group" *

Musical ensemble A musical ensemble, also known as a music group, musical group, or a band is a group of people who perform Instrumental music, instrumental and/or vocal music, with the ensemble typically known by a distinct name. Some music ensembles consist ...