A monitor is a piece of computer hardware that displays information in visual form. It typically consists of a display device, circuitry, casing, and power supply. The weight of a monitor can vary depending on its size and features, but is typically between 3 and 10 pounds.
The weight of a monitor is not generally a consideration when purchasing one, but may be important if you need to transport it frequently. The weight will also affect how the monitor is mounted, so it is something to keep in mind if you plan on mounting your monitor on a wall or other surface.
Most monitors use LCD or LED technology, which are very lightweight. CRT monitors are much heavier, so if you have an older monitor, it may be quite a bit heavier than a newer one. The weight of a monitor is not generally a factor in its price, but may be important to you if you need to move it around often.