I'm 43 and just bought my first MacBook. I started reading a book on Python and it had me open a terminal window and use commands like LS and CD. These were new to me and I learned they are Linux commands. So are Apple computers Linux computers and if not why are Linux commands used in the terminal window? Or are Apple computers/terminal windows Linux-like, a new term I've come across? Today is day one so I hope that explains why this question is probably very basic. Thanks for your help.