Diffchecker is a tool that allows users to compare two text files or documents and see the differences between them. It can be used to identify changes made to a document, highlight the added or deleted content, and show the overall changes in a clear and concise way. Diffchecker can be useful for a wide range of purposes, such as reviewing and comparing code, checking for plagiarism, or simply comparing two versions of a document to see what has been modified. It is a simple and easy-to-use tool that can save time and effort when working with multiple versions of a document or text file.