Eli5 what os the difference between iMessage and text message and why it even matters?

Question

Eli5 what os the difference between iMessage and text message and why it even matters?

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Answer 1

Text messages/SMS are phone calls that are in text form.

iMessage uses the internet like WhatsApp, it’s sending short emails.

So iMessage can send with only Wi-Fi and no cell signal to devices that aren’t phones, where strictly SMS cannot.