What is a black line in legal terms?

In legal terms, a "black line" typically refers to a marked-up version of a document, such as a contract or legal brief, that shows the changes made compared to a previous version. This includes additions, deletions, and modifications, often highlighted in different colors or through strikethroughs. The term is commonly used in legal practice to facilitate the review and negotiation of documents. Black lines help ensure clarity and transparency in the revision process.