Use <command> & to run in the background of terminal, but not detached, meaning the process will be killed after the terminal window is closed.
Use nohup <command> & to detach from the terminal, and suppress all the outputs.
[1] [2]
nohup must be used before a <command>.
If already launched, use disown to achieve the same effect, detaching the process, runing in background, and allowing close the terminal. [2]