Emacs can be run as a server and client rather than just a single process. The biggest advantage of running emacs in this way is that the client starts instantaneously, a huge performance boost.

The emacs server can be started with the following command:

emacs –daemon

There are a few options that can be used to start the emacs server. With –fg-daemon["<server name>"], Emacs stays bound to the terminal, so you can terminate it by pressing Ctrl-C. With –bg-daemon["<server name>"] and –daemon, Emacs detaches from the terminal and runs fully in the background. Typically –fg-daemon["<server name>"] is used for service launchers like launchctl on MacOS and systemctl on Linux

The emacs server can also be started using brew services if this was used to install emacs. Here emacs-plus@29 emacs version is started with home brow:

brew services start emacs-plus@29