Operating System
Simple Explanation
The main software that helps a phone, tablet or computer run. It manages the device and lets other apps work. Windows, macOS, Android and iOS are examples.
Technical Explanation
An operating system manages hardware resources, processes, memory, files, security boundaries and interfaces used by applications. It provides services between programs and the underlying device.
Business Use Case
An IT department keeps office computers on supported operating-system versions to receive security fixes.
Real-Life Example
You install an Android or iPhone system update to get fixes and new device features.