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how does whatsapp know if a message has been read?

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2021-07-06 17:07:33 UTC
does signal do it differently?
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2021-10-11 05:46:18 UTC
<p>WhatsApp is a centralized encrypted instant messaging service.</p><p><br></p><p>When you open your WhatsApp to read a message, your phone sends a notification to the central server that you just read the message. This central server then sends this notification to whoever sent you the message. That's how you (or they) know when a message was read.</p><p><br></p><p>Signal is also a centralized encrypted instant messaging service, and it also handles this in a similar way.</p>