In the new WhatsApp update, if you see a pair of green check marks next to the sent message, you can rest assured that the message has been read by the recipient. In case the user sends a message to the group or sends a broadcast message, the green markers will only appear when all recipients have read the message you sent.
Besides, the Message Info feature also allows you to display details of messages in WhatsApp. To use Message Info, keep a message you sent and click Info or Info icon ( small "i" inside the circle ) to view the message information.
In addition, if you see the message Deliverd ( sent ) appears next to the message, you can be sure that the message has been sent to the recipient, but they have not read it yet. Otherwise, the message Read or Seen ( read ) will appear if the enemy has viewed the message, photo or video you sent. In addition, the phrase Played ( heard ) appears below the audio message indicating that the recipient has heard your message.