Grammarly is a digital writing assistant that helps users improve their writing skills by offering grammar, spelling, punctuation, and style suggestions. It can be used as a browser extension, a standalone application, or an integrated tool within various text editors. The service provides real-time feedback and can be customized to a user's writing style, offering suggestions for clarity, engagement, and delivery. Subscribing to Grammarly Premium unlocks advanced features such as genre-specific writing style checks, a plagiarism detector, vocabulary enhancement suggestions, and more in-depth insights into writing style and clarity.