If we talk about metalloids meaning: these are the elements which possess the properties of metals and non-metals. Which means they have both dull and shiny appearances and exist in various forms. They are sometimes good conductors of electricity and sometimes not, which makes them known as "semiconductors". Metalloids play a big role as semiconductors as they are used in some essential electronic devices like computers. They are also used to make batteries, ceramic and polymers. Silicon, Arsenic, Germanium, and Boron are some common metalloids.