Why does only one checkmark appear when sending a message in WhatsApp - briefly?
When you send a message on WhatsApp, it first receives one checkmark to indicate that the message has been sent from your device but not yet delivered to the recipient's phone. This is because WhatsApp uses end-to-end encryption and needs confirmation from the server that the message was successfully forwarded before showing the second checkmark.
Why does only one checkmark appear when sending a message in WhatsApp - in detail?
When you send a message on WhatsApp, you might notice that only one checkmark appears next to your sent message. This is because the single checkmark indicates that your message has been successfully delivered from your device to WhatsApp's servers. However, it does not confirm whether the recipient has received or read the message yet.
WhatsApp uses a system of checkmarks to signify different stages in the message delivery process. The first checkmark (delivery confirmation) tells you that your message has left your device and is on its way to the recipient's phone via WhatsApp’s servers. At this point, the message is still queued on WhatsApp’s server waiting for the recipient’s device to connect and download it.
For a message to be fully delivered (and thus show two checkmarks), the recipient’s device needs to be online and able to receive messages from WhatsApp's servers. If the recipient has their phone turned off, is in airplane mode, or lacks an internet connection, your message will remain on WhatsApp's server until their device becomes available again.
In summary, the appearance of only one checkmark after sending a message on WhatsApp signifies that your message has been successfully delivered to WhatsApp’s servers but is still awaiting receipt by the recipient’s device.