Definite Article: The
The definite article refers to a noun, either in the singular or plural. It can be used with uncountable nouns. The refers to a specific thing or quantity. It should be placed before the noun, or before the adjective which directly modifies the noun.
Please give me the hammer.
Please give me the red hammer; the blue one is too small.
Please give me the nail.
Please give me the large nail; it’s the only one strong enough to hold up this painting.
Please give me the hammer and the nail.