What does one checkmark mean in WhatsApp for a message?

What does one checkmark mean in WhatsApp for a message - briefly?

In WhatsApp, a single checkmark next to a message indicates that it has been successfully sent from your device but not yet delivered to the recipient's phone. This means the message is in transit and has not reached its destination yet.

What does one checkmark mean in WhatsApp for a message - in detail?

In WhatsApp, the appearance of a single checkmark next to a message indicates that it has been successfully sent from your device. This mark serves as an initial confirmation that the message has left your phone and is currently in transit to the recipient's device. It is important to note that at this stage, the message has not yet reached the recipient, nor has it been delivered or read by them. The single checkmark simply signifies successful transmission from the sender's end, ensuring that the message is on its way through WhatsApp's servers towards the intended recipient. Once the recipient's device receives and acknowledges the message, a second checkmark will appear, indicating delivery. If the message has been read by the recipient, two blue checkmarks will be displayed. Thus, the single checkmark provides a crucial initial step in verifying that your communication is underway.