A determiner is a word that determines or qualifies the meaning of a noun by expressing such concepts as quantity or definiteness. There is never more than one determiner per noun and it is always placed before the noun.
Determiners always agree in gender and number with the nouns they modify.
Articles are the main group of determiners in French. They are all translated as 'the' in English. The waiter gives the wine list to Tex. They are translated as 'a' or 'an' in English. Tex choisit un vin.