1. Windows：
Windows是Microsoft Incorporation提供的一组各种专有图形操作系统。它也被称为Microsoft Windows 。它目前包括Windows NT和Windows IoT作为其家族的成员。早期包括不再使用的Windows 9x，Windows Mobile和Windows Phone。它是个人计算机中使用最多的操作系统。 Microsoft于1985年发布了Windows的第一个版本。用于个人计算机的Windows的最新版本是Windows 10。
2. iOS：
iOS是苹果公司提供的移动操作系统。它主要是为iPhone和iPod Touch等Apple移动设备设计的。它以前被称为iPhone OS。它是基于Darwin(BSD)操作系统的类Unix操作系统。它是仅次于Android的世界第二使用最多的移动操作系统。它主要用C，C++，Objective-C，汇编语言和Swift编写。 iOS的第一个版本于2007年发布。iOS的最新稳定版本是13.1。
Windows和iOS之间的区别：
| WINDOWS | IOS |
|---|---|
| It was developed and is owned by Microsoft Incorporation. | It was developed and is owned by Apple Incorporation. |
| It was launched in 1985. | It was launched in 2007. |
| Current stable version is Windows 10. | Current stable version is 13.1. |
| It is for workstation, personal computers, media center, tablets and embedded systems. | Its target system type are smartphone, music player and tablet computer. |
| Computer architectures supported by Windows are IA-32, x86-64, IA-64, ARM, Alpha, MIPS and PowerPC. | Computer architectures supported are ARMv8-A (iOS 7-present), ARMv7-A (iPhone OS 3-iOS 10) and ARMv6 (iPhone OS 1-iOS 4.2.1). |
| Kernel type is Hybrid with modules. | Kernel type is Hybrid. |
| The native APIs are Win32 and NT API. | The native APIs are Cocoa and BSD-POSIX. |
| Preferred license is Proprietary and Source available. | Preferred license is Proprietary, APSL and GNU GPL. |
| Update management is Windows Update. | Update management is Software Update. |
| It charges for original version. | It is free of cost. |
| File systems supported are NTFS, FAT, ISO 9660, UDF, HFS+, FATX and HFS. | File systems supported are HFS+ and APFS. |