Twilio
Twilio is a cloud communications platform that provides tools and services for developers to add messaging, voice, and video capabilities into their applications. It offers APIs (Application Programming Interfaces) that enable developers to integrate communication functionalities, such as sending SMS (Short Message Service) messages, making voice calls, handling two-factor authentication (2FA) and building interactive voice response (IVR) systems, among others, into their software applications.
It can improve customer relationships as it helps manage multichannel communication to reach customers through their preferred method of contact. Twilio allows even non-developers to visually create, edit, and manage communication workflows. It can be integrated with a wide variety of software for A/B testing, advertising analytics and more.