Pastel is a collaborative tool designed to streamline the feedback process for creative projects, particularly websites and digital design. It allows users to leave comments directly on live websites by simply clicking on any part of the page, making it easier to provide precise feedback and suggestions. The platform is useful for teams and clients working collaboratively, as it centralizes feedback and discussions, helping to eliminate long email threads and screenshots. Pastel's service is accessible via their website, https://usepastel.com/, where users can sign up to start making their review and feedback process more efficient.