Twilio is a cloud communications platform that provides building blocks for messaging, voice, and video integration into web and mobile applications. It offers a customizable API that can be integrated with Sentry for alerts, including options for SMS notifications via Twilio. The Sentry-Twilio plugin is easily installable in one line of code and requires four pieces of information to correctly configure, which include the Account SID, Auth Token, SMS From number, and SMS To numbers.