As of 2025, the most common operating system in the world across all device types is Android, which holds approximately 46% of the global market share. Android is especially dominant on mobile devices, with around 72% market share on smartphones and tablets. For desktop and laptop computers specifically, Microsoft Windows is the most common, holding about 71% of the global market share. Apple's macOS and Linux follow with smaller shares. To summarize:

• Overall most common OS: Android (46%)
• Most common desktop OS: Windows (71%)
• Other notable OS shares: iOS (18%), macOS (6%), Linux (4%)

This reflects the widespread use of mobile devices running Android and the strong presence of Windows in desktop computing environments.