Generally, just a biography, an autobiography is a biography written by the person about themselves :)
One of the most common reasons for unintentional plagiarism is using words directly from a article but not quoting it. You can also include copying and pasting directly from a article.
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The indefinite article is the word a<span> (or </span>an when it helps pronunciation<span>). It is used before a noun to describe it as something non-specific.</span>