Macs are very stable, but not every Mac application is. Every once in a while, something you’re using is going to crash. Sometimes this means the spinning beach ball of death, sometimes this means clicking an open window doesn’t do anything, no matter what you try. Sometimes the Dock indicates an application is open, but you can’t seem to find or open any windows.
While checking out Activity Monitor, you noticed a couple of processes you don’t recognize: mds and mdworker. Neither have an icon, and they seem to be running constantly. Don’t worry, they’re harmless.
You settle in to do some work, but first, you check email for a second. Okay, now work. Wait: let’s check Facebook. Work now? In a bit: first Twitter, then back to email, then Facebook one more time in case anyone responded.
Some of the coolest new features in the upcoming macOS 10.13 High Sierra are in Safari, and you can try them out now without upgrading your entire operating system.
You recognize most of the processes you see while browsing Activity Monitor, but not hidd. The name is cryptic, and there’s no icon for you to recognize. Should you be worried?