Presentations are still held via projectors in a dark room, because it’s the most effective and convenient method. A projector is similar to an inverted camera in that it spits light out of a lens rather than receiving it. For the purposes of this buying guide, we’ll focus on digital projectors—that is, projectors with video input data that perform similar tasks to a TV or computer monitor while providing a number of advantages, such as larger image sizes, increased portability, and more flexible installation options; the principles apply to all types of projectors. However, it is useful to categorize digital projectors into four groups: Home theater; Multimedia; Huge venue and fixed installation; Pocket, sometimes known as “pico” ultra-portable, if a small screen size is appropriate. Naturally, there will be some overlapping, and not all designs will simply fall into one of the categories. When you have the right knowledge, choosing a projector may be a breeze because there are so many possibilities. Most significantly, the width of the screen; Throw distance is the distance between both the projector and the screen. The quantity of ambient light in the room where the projector will be used is estimated. The first two bits of info in the equation are used to establish the throw ratio: What is the distance between the projector and the screen, and how big is the screen? A separate purchase guide is needed for projector screens. The two most common light technologies used in projectors are LED and metal halide. If you are aware with the qualifications, selecting the proper projector is an easy task.