Twilio has updated its API Explorer, providing developers with a more robust tool for building and testing communications apps. The new updates allow users to make API requests directly in their browser, making it easier to test and deploy applications. The API Explorer now features tools such as modifying live calls, viewing available phone numbers, creating conference lines, managing SIP Domains, and more. This update is part of Twilio's ongoing investment in developer tools, aiming to enhance the development process for its users.