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。 Windows的第一个版本由Microsoft于1985年发布。它具有带有模块的混合内核。
2. NetBSD：
NetBSD是由NetBSD Foundation提供的免费开放源代码操作系统。它基于Berkeley软件发行版。它是一个类似Unix的操作系统。它可用于许多平台，包括服务器，台式机，手持设备和嵌入式系统。 NetBSD项目着重于精心设计，在许多计算机体系结构中的代码清晰度和可移植性。 NetBSD的源代码是公开可用的，并已获得许可。 NetBSD的第一个版本于1993年发布，其内核类型是单片的。
Windows和NetBSD之间的区别：
| S.No. | WINDOWS | NETBSD |
|---|---|---|
| 1. | It was developed and is owned by Microsoft Incorporation. | It was developed and is owned by The NetBSD Foundation. |
| 2. | It was launched in 1985. | It was launched in 1993. |
| 3. | It is not an open source operating system. | It is an open source operating system. |
| 4. | Its target systems types are workstation, personal computers, media center, tablets and embedded systems. | Its target system types are NAS, server, workstation and embedded systems. |
| 5. | Computer architectures supported by Windows are IA-32, x86-64, IA-64, ARM, Alpha, MIPS and PowerPC. | Computer architectures supported by NetBSD are IA-32, x86-64, ARM, MIPS, PowerPC and sparc64. |
| 6. | Its kernel type is Hybrid with modules. | Its kernel type is Monolithic with modules. |
| 7. | Its native APIs are Win32 and NT API. | Its native APIs are BSD-POSIX. |
| 8. | It has the preferred license Proprietary and Source available. | It has the preferred license of BSD. |
| 9. | The non-native APIs supported through its subsystems are DOS API, Win16, POSIX and .NET. | The non-native APIs supported through its subsystems are Linux and others. |
| 10. | File systems supported by Windows are NTFS, FAT, ISO 9660, UDF, HFS+, FATX and HFS. | File systems supported by NetBSD are UFS, UFS2, ext2, FAT, ISO 9660, NFS and LFS. |
| 11. | Its package management is MSI or custom installer. | Its package management is pkgsrc. |
| 12. | Its update management is Windows Update. | Its update management is by source or by binary. |