The indefinite article takes two forms. It’s the word a when it precedes a word that begins with a consonant sound. It’s the word an when it precedes a word that begins with a vowel sound. The indefinite article indicates that a noun refers to a general idea or category of a thing rather than a specific thing.
For example, you might ask your friend, “Should I bring a gift to the party?” Your friend will understand that you are not asking about a specific type of gift or a specific item. “I am going to bring an apple pie,” your friend tells you. Again, the indefinite article indicates that she is not talking about a particular apple pie. Your friend probably doesn’t even have any pie yet. The indefinite article appears only with singular nouns. Consider the following examples of indefinite articles used in context:
- Please hand me a book; any book will do.
- Please hand me an autobiography; any autobiography will do.