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. FreeBSD：
FreeBSD 是 FreeBSD 项目提供的免费开源操作系统。它是在两个类 Unix 操作系统 Berkeley Software Distribution (BSD) 和 Research Unix 的基础上设计的。它与 Linux 操作系统非常相似。它是早期著名的操作系统之一，但与其他操作系统相比，现在使用较少。 FreeBSD 的第一个版本于 1993 年推出。FreeBSD 的最新稳定版本是 12.1。
Windows 和 FreeBSD 的区别：
| WINDOWS | FREEBSD |
|---|---|
| It was developed and is owned by Microsoft Incorporation. | It was developed and is owned by The FreeBSD Project. |
| It was launched in 1985. | It was launched in 1993. |
| It is designed for PC of all companies. | It is not designed for personal computers. |
| Current stable version is Windows 10. | Current stable version is 12.1. |
| It is for workstation, personal computers, media center, tablets and embedded systems. | Its target system type is server, workstation, NAS and embedded systems. |
| Computer architectures supported by Windows are IA-32, x86-64, IA-64, ARM, Alpha, MIPS and PowerPC. | Computer architectures supported are IA-32, x86-64, ARM, MIPS and PowerPC. |
| Kernel type is Hybrid with modules here. | Kernel type is Monolithic with modules. |
| Package management is MSI or custom installer. | Package management is Port collections and packages. |
| The native APIs are Win32 and NT API. | The native APIs are BSD/POSIX. |
| File systems supported are NTFS, FAT, ISO 9660, UDF, HFS+, FATX and HFS. | File systems supported are UFS2, ZFS, ext2, ext3, FAT, ISO 9660, UDF and NFS. |
| Preferred license is Proprietary and Source available. | Preferred license is BSD. |