Metals are very useful to every one, they are used as pipes, some lamps, and they are used in cords. But what is a metal? A metal is a solid element that is malleable, a terrific conductor, and t has a lot of luster(shininess), and ductile.
non-metals are pretty much the opposite.they are still a solid of course, but they aren't malleable, they are terrible conductors, and they aren't as shiny.
Metalloids are like metal and nonmetal had a kid. They are weak conductors,they are only slightly shiny, and not malleable... that's it.