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Articles in English act as signaling words that frame how a listener should interpret a noun. The indefinite articles 'a' and 'an' introduce one non-specific item from a larger category. The definite article 'the' points to a specific, identifiable item that both the speaker and listener can locate in the context. Leaving out the article entirely indicates that a plural or uncountable noun refers to a general idea, substance, or category rather than a restricted group.

Could you send an updated report to the project manager?