The red highlighted item in the image below is the notification icon. It is at the top of the screen next to your profile name and image. A red dot near the bell indicates that there are unread notifications.

Clicking the bell icon shown in the image to the right displays the notification panel shown to the right below the bell.
You can mark all notifications as read by clicking the "Set all as read" link or you can mark a single notification by clicking the "set as read" link next to each notification.
Notifications are sent in real-time. Also, a
desktop push notification is shown when a notification is received.
The “See all notifications” link will open the “Notifications List” shown below.
