Learn in the textbookOutput Devices (Display and Printing)
DefinitionA projector (プロジェクター) is a display device that enlarges an image with light and casts it onto a screen or wall.
ExplanationIt has no screen of its own; it enlarges the image made inside through a lens and projects it onto a distant surface. It suits meeting rooms and classrooms where many people watch the same image, and its brightness is rated in lumens (ルーメン), a measure of the amount of light.
AnalogyIt is like the game of casting big shadow shapes on a wall with a flashlight. Putting a picture into the light turns a blank wall into a screen.
Memory hookProject means to throw forward. Remember it by its roots: a device that throws light forward to show an image.