In macOS, the "sudo" command stands for "superuser do." It allows users with the necessary privileges to execute commands with the security privileges of another user, typically the superuser or root. When you use "sudo" before a command in the terminal, it grants temporary administrative rights to that command, enabling you to perform actions that would normally require superuser access. This can include installing software, modifying system files, and other administrative tasks. It's important to exercise caution when using "sudo" as it can make significant changes to the system and should only be used when necessary.