Grammar checkers are software tools designed to identify and correct grammatical errors in written text. They analyze sentences for issues such as punctuation mistakes, subject-verb agreement, and sentence structure. Many grammar checkers also provide suggestions for improving clarity and style, making them useful for both casual writers and professionals. These tools can be found in various forms, including standalone applications and integrated features in word processors like Microsoft Word or Google Docs. Some popular grammar checkers, such as Grammarly and ProWritingAid, offer additional functionalities like plagiarism detection and vocabulary enhancement, helping users produce polished writing.