Twilio is a cloud communications platform as a service (CPaaS). Twilio facilitates programmatically send and receive text messages, and perform other communication functions using its web service APIs.
Read the official documentation of Twilio here.
Twilio on Connect iPaaS¶
Connect iPaaS enables you to integrate Twilio with other SaaS and enterprise applications. You can build a workflow to send and receive SMS in real-time based on certain events in other applications. Conversely, you can perform actions on other applications based on certain events or SMS received on the phone number provided in your Twilio account.