Grammarly is a powerful grammar checking tool that helps users check for grammatical errors, spelling mistakes, punctuation, and other issues in their writing, enhancing both the quality and readability of their work. Grammarly also provides features like vocabulary expansion, sentence restructuring, and style suggestions to make users' writing smoother and more natural. Grammarly is suitable for various writing scenarios, including academic papers, business emails, and social media. Users can choose from a free or paid version, with the paid version offering more advanced features.