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Used before singular countable nouns when

Used before singular countable nouns when referring to something general or mentioned for the first time. 'A' is used before consonant sounds, 'an' be

Used to refer to specific

Used to refer to specific or particular nouns that are already known to both speaker and listener. Can be used with singular, plural, and uncountable

The choice between 'a' and 'an'

The choice between 'a' and 'an' depends on the first sound of the following word, not the first letter. 'A' before consonant sounds (a horse, a Europe

Many situations require no article at

Many situations require no article at all, including: uncountable nouns in general sense, plural nouns in general sense, proper nouns, languages, meal

'The' is always used with superlatives

'The' is always used with superlatives (the best, the tallest) and items that are unique or one-of-a-kind (the sun, the moon, the Taj Mahal).