The NES is one of the earlier video games systems that was developed for TV use. Systems such as the Atari, among others came about about a decade earlier, but the NES is what brought the video game industry back to its feet after a steady decline in 1984. Many games came out for this system, and development for it lasted for roughly a decade.
It can have two controllers, as well as a couple of optional attachments that plugged into the controller ports. The games are cartridge based.
Of the many games that came out for this system, one of the most well remembered, and popular to this day is the Legend of Zelda, which eventually was turned into a series.
This system was eventually replaced by the Super Nintendo Entertainment System in 1991 (USA release).