Flock is a web browser built on the Chromium open-source project, offering features such as tabbed browsing, bookmark management, and a customizable start page. It also includes built-in collaboration tools, allowing users to share links, notes, and to-do lists with their team members. Additionally, Flock integrates with popular social media platforms like Facebook, Twitter, and LinkedIn, making it easy to stay connected with friends and colleagues. Finally, Flock includes security and privacy features like anti-phishing and ad-blocking.