Requests is a feature in the Insights tool that helps developers debug outgoing HTTP requests, providing insights into call frequency, response times, and error rates to troubleshoot issues with third-party APIs. It offers features such as checking if a service is down for everyone or just the user, identifying rate limiting issues, and tracking down bugs in integrations with third-party APIs. Requests is included in Sentry's Business and Enterprise plans and can be accessed through the docs or by trying it out in a Sentry account.