Unlike a normal phone call or text message, both chat participants are able to see each other, provided that they have the right hardware.
Video chats occur in real-time and are a more personal form of communication.
Well, the simplest way to put it is that there is always room for improvement!
Every app you go to is not perfect, and every competitor of that application also isn't perfect, but the one thing they all have in common is they are all always looking at what the other one is doing and trying to make improvements so they can win the battle!
A webcam is required to broadcast video of yourself and a microphone is necessary for the audio.