eli5 how does the technology work that allows a computer software to send text messages?

Question

I use a cloud based scheduling software and I can tell it to text message a client an appointment reminder 24 hours before their appointment. How does the software actually send text messages?

Edited for clarity

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Answer 1

It’s not entirely clear what technology you are actually asking about. The texting? Cloud services? Scheduling? Because depending on the depth of the question, the answers can go from very complex to “It’s a timer”, so some more detail would be helpful.