1. 系统：
macOS 是 Apple Incorporation 提供的一系列专有图形操作系统。它早期被称为 Mac OS X，后来被称为 OS X。它是专门为 Apple mac 计算机设计的。它基于Unix操作系统。它是使用 C、C++、Objective-C、汇编语言和 Swift 开发的。它是个人计算机中仅次于 Windows 的第二大常用操作系统。苹果公司于 2001 年推出了 macOS 的第一个版本。
2. DragonFlyBSD :
DragonFly BSD 是由 Matthew Dillon 开发的免费开源操作系统。它是一个类 Unix 操作系统，其设计灵感来自 FreeBSD 操作系统。基本不用于个人电脑。它专为服务器、工作站、NAS 和嵌入式系统而设计。主要使用的编程语言是C语言。 DragonFly BSD 的第一个版本于 2003 年推出。它具有 Hybrid 内核。
macOS 和 DragonFlyBSD 的区别：
| S.No. | MACOS | DRAGONFLYBSD |
|---|---|---|
| 1. | It was developed by Apple Incorporation. | It was developed by Matthew Dillon. |
| 2. | It was launched in 2001. | It was launched in 2003. |
| 3. | Its target system types are workstation, personal computers and embedded systems. | Its target system types are workstation, server, NAS and embedded systems. |
| 4. | Computer architectures supported by macOS are x86-64(10.4.7-present), IA-32(10.4.4-10.6.8) and PowerPC(10.0-10.5.8). | Computer architectures supported by DragonFlyBSD is x86-64. |
| 5. | Its kernel type is Hybrid with modules. | Its kernel type is Hybrid. |
| 6. | Its package management is macOS installer. | Its package management is dports or pkg. |
| 7. | Its update management is Software Update. | Its update management are git, cvsup, rsync and pkg. |
| 8. | Its native APIs are Carbon, Cocoa, Java and BSD-POSIX. | Its native APIs are BSD/POSIX. |
| 9. | It has the preferred license of Proprietary, APSL and GNU GPL. | It has the preferred license of BSD. |
| 10. | The non-native APIs supported by its subsystems are Toolbox, Win16 and Win32. | The non-native APIs supported by subsystems are Mono, Java, Win16, Win32 and Linux. |
| 11. | File systems supported by macOS are HFS+, APFS, HFS, UFS, AFP, ISO 9660, FAT, UDF, NFS, SMBFS, NTFS, FTP, WebDAV and ZFS. | File systems supported by DragonFlyBSD are UFS1, MFS, ext2, FAT, HAMMER and ISO 9660. |