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Document comparison, also known as redlining or blacklining, is a computer process by which changes are identified between two versions of the same document for the purposes of document editing and review. Document comparison is a common task in the legal and financial industries.
The software-based document comparison process compares a reference document to a target document, and produces a third document which indicates information that has either been added to or removed from the reference document to produce the target document.
Common documents formats for comparison include word processing documents , spreadsheets, presentations , and Portable Document Format documents.