Grammarly is an AI-powered online writing assistant designed to improve users' writing skills. Key features and advantages include:

• Real-time feedback: Offers suggestions on grammar, spelling, punctuation, clarity, style, and tone
• Wide integration: Seamlessly integrates with 500,000+ apps and websites across various platforms
• Versatile usage: Suitable for individuals, teams, businesses, and educational institutions

Use cases for Grammarly cater to various writing needs:

• Students and professionals aiming to improve their writing quality and clarity
• Businesses and teams seeking to maintain a consistent writing style and tone
• Educational institutions looking to enhance students' writing skills and prevent plagiarism

Overall, Grammarly provides a comprehensive solution for users to enhance their writing skills, with a range of plans and resources to suit different needs.