A company that provides communications APIs, such as SMS and voice.
It offers communication features -- phone, SMS, chat, and more -- as APIs, making it easy to embed communication capabilities into an app. Twilio was one of the earliest companies to abstract complex telecom infrastructure -- phone networks, SMS gateways -- behind an API developers could call with a few lines of code, and it became influential enough that 'Twilio for X' turned into shorthand for the whole business model of API-ifying complex infrastructure.
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