Android and iOS are both mobile operating systems. Android is open-source, meaning its source code is available for everyone to explore and modify, while iOS is closed-source and exclusively owned by Apple. Android's customizable interface allows for greater app design options, while iOS offers better security features with its closed ecosystem. Android's larger marketplace provides more app options, and it has a greater market share worldwide compared to iOS.
Android devices come in different shapes and sizes, while most iOS devices are Apple products. As such, each platform requires different development strategies. That said, each has its advantages and disadvantages, so choose based on project needs.