Unintentional plagiarism occurs when a person mistakenly presents someone else's work, ideas, or expressions as their own without proper acknowledgment, often due to ignorance or oversight. This can happen in academic writing when the individual fails to cite sources correctly, paraphrases without crediting the original author, or inadvertently uses language that closely resembles the source material. Understanding this concept is crucial for maintaining integrity and ensuring accurate representation of evidence and sources in any form of communication.