Sectarianism is a debated concept. Some scholars and journalists define it as pre-existing fixed communal categories in society, and use it to explain political, cultural, or religious conflicts between groups. Others conceive of sectarianism as a set of social practices where daily life is organized on the basis of communal norms and rules that individuals strategically use and transcend. This definition highlights the co-constitutive aspect of sectarianism and people's agency, as opposed to understanding sectarianism as being fixed and incompatible communal boundaries.
While sectarianism is often labelled as religious or political, the reality of a sectarian situation is usually much more complex. In its most basic form, sectarianism has been defined as, 'the existence, within a locality, of two or more divided and actively competing communal identities, resulting in a strong sense of dualism which unremittingly transcends commonality, and is both culturally and physically manifest.'