1. 视窗：
Windows 是一组由 Microsoft Incorporation 提供的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 作为其家族成员。早些时候，它包括不再使用的 Windows 9x、Windows Mobile 和 Windows Phone。它是个人计算机中最常用的操作系统。 Windows 的第一个版本由 Microsoft 于 1985 年推出。用于个人计算机的 Windows 的最新版本是 Windows 10。
2.IBM i :
IBM i 是IBM 提供的操作系统或操作环境。它为 IBM Power Systems 提供了一个抽象接口。它通过位于技术独立机器接口和系统许可内码或内核之上的低级机器接口代码或微代码层工作。它使 IBM Power 平台能够支持各种业务应用程序，并且可以与其他操作系统共存。它是一个闭源操作系统。 IBM i 的第一个版本于 1988 年推出。IBM i 的最新稳定版本是 7.3。
Windows 和 IBM i 的区别：
| WINDOWS | IBM I |
|---|---|
| It was developed and is owned by Microsoft Incorporation. | It was developed and is owned by IBM. |
| It was launched in 1985. | It was launched in 1988. |
| Current stable version is Windows 10. | Current stable version is 7.3. |
| Kernel type is Hybrid with modules. | Kernel type is Microkernel and Virtual machine. |
| It is used for personal computers. | It is not used for personal computers. |
| It is used in computers of all companies. | It is majorly used in IBM devices. |
| It charges for original version. | It is bundled with hardware. |
| Preferred license is Proprietary and Source available. | Preferred license is Proprietary. |
| Its target system are workstation, personal computers, media center, tablets and embedded systems. | Its target system type are minicomputer and server. |