In the video, a man is standing in front of a whiteboard. He is wearing a black t-shirt and a black cap. He is holding a red marker in his hand and is pointing to a diagram on the whiteboard. The diagram consists of two circles connected by arrows. The man is speaking and appears to be explaining the diagram. The whiteboard is clean except for the diagram and the man's handwriting. The man's gestures suggest that he is emphasizing certain parts of the diagram. The video seems to be taken in a classroom or office setting.