As you open applications on your Mac, you may notice your Dock getting a little crowded. That’s because OS X adds an icon for each running app to your Dock as soon as you launch it, to let you know that it’s actually doing something. It’s one of the many great visual reminders built into the operating system.
Sometimes, though, your Dock might get a little too crowded. In which case, you can do a couple of different things to get rid of the Dock icon while the app in question is running, though it’s not without its downsides..