What does a single checkmark on a WhatsApp message mean - briefly?
A single checkmark on a WhatsApp message indicates that the message has been successfully sent from your device but has not yet been delivered to the recipient's phone.
What does a single checkmark on a WhatsApp message mean - in detail?
A single checkmark on a WhatsApp message signifies that your message has been successfully sent from your device to the WhatsApp servers, but it has not yet been delivered to the recipient's phone. This status indicator is visible only to the sender and provides an initial confirmation of successful transmission. It does not guarantee that the recipient has seen or read the message; rather, it merely confirms that the message has left your device and is on its way through WhatsApp's infrastructure. Once the message reaches the recipient's phone, the checkmark will turn blue, indicating delivery.