"Video chat" is a feature of a social networking application that allows users to have real-time video conversations with their friends or contacts.  When this feature is enabled, users can initiate a video call with another user and see and hear them in real-time through their device's camera and microphone.  This feature is designed to enhance the user experience by providing a more immersive and personal way to communicate, allowing users to feel closer to their friends and contacts even if they are physically far away.  Video-chat is particularly useful for long-distance relationships, as it allows users to maintain a sense of connection and intimacy despite the distance.  Overall, video-chat is a powerful tool for building meaningful relationships and staying connected with loved ones, no matter where they are located in the world.