

iOS and iPadOS have similar underpinnings, as do many other computers. Reinvented as Mac OS X in 2001, this was a completely redesigned version of the Macintosh OS which used a variant of a Unix kernel known as BSD, an enterprise-grade OS designed for maximum reliability that can trace its origins as far back as 1960s.

Rather than allowing a wayward app to hold the resources it has claimed, possibly using memory and processor time, it should be shut down quickly so that the system can return to normal.Īpple's macOS is a very stable operating system (OS) likely owing to its origins. While errors like this don't happen often, the infrequency can make it harder to remember what to do to solve the issue when it arises. Apple allows MacBook notebooks and Mac desktops to quit an app even when it becomes non-responsive by using a 'Force Quit' option.
