English forces a choice before many nouns: a, an, or the. An article is a determiner that marks a noun phrase as definite or indefinite and helps signal whether the referent is already identifiable in the discourse.

Definite articles typically pick out a uniquely recoverable entity; indefinite articles introduce a non-unique or new one. Some languages lack articles and rely on word order, case, or context instead. Others encode further distinctions such as specificity.

Article use is notoriously hard for learners whose first language has no parallel category. Even advanced speakers may stumble on subtle contexts. Grammars devote substantial space to the pragmatic conditions that govern article choice.

• Determiner marking definiteness
• Contrasts definite and indefinite reference
• Absent in some languages
• Difficult for many second-language learners