A video head is a special type of tripod head designed for smooth, controlled movements. Unlike a ball head that rotates in all directions (like a photo head), a video head moves in two directions: horizontal and vertical.
A video head is useful when using a telescope because you can aim precisely and smoothly, even at high magnification. This is especially helpful when following birds, mammals, or other moving subjects in nature. The fluid damping in the head ensures that movements are calm and even, without jerks or sudden shifts in the image.
The tripod is the base with legs that provides stability. The video head sits on top of the tripod and allows smooth movements to aim the telescope.