WINDOWS: the most popular , it has more than 10 versions , created in the mid-1980s, MACOS: safe , the most expensive, Mojave, High Sierra, Sierra, IOS: for iphones, for ipads , ANDROID: for cellphones, for tablets , LINUX: open-source, free, customizable, HARMONY OS: the newest operating system , realeased in 2021, for Huawei's devices,

operating systems classify

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