iOS is the operating system developed by Apple for its mobile devices, including the iPhone and iPad. It offers a user-friendly interface with features like Siri, a voice-activated assistant that helps users perform tasks hands-free. Additionally, iOS supports a wide range of applications through the App Store, allowing users to customize their devices with various tools and entertainment options. Another key feature of iOS is its focus on security and privacy. Users benefit from regular updates that enhance system performance and protect against vulnerabilities. The operating system also includes features like Face ID and Touch ID for secure authentication, ensuring that personal data remains safe and accessible only to the user.