Throw distance refers to the distance between a projector and the screen or projection surface. It is a critical factor to consider when setting up a projector, as it determines the size of the projected image.  Understanding the throw distance is essential for selecting the right projector for your space and ensuring that the image size fits your needs.  Different projectors have different throw ratios, which specify how far a projector needs to be from the screen to achieve a specific image size.  Matching the throw distance to your space is crucial for optimal image quality and clarity in your presentations or entertainment setup.