In the following lessons, I look at what is new in macOS Catalina. Apple introduced macOS Catalina in October of 2019, and it brought with it several changes. Most changes are underneath the GUI or Graphical User Interface, so most of what I mention in my macOS tutorial will also cover macOS Catalina. Saying that though, there are some visual changes in a few items, as well as some new features which were introduced in macOS Catalina, . I cover these changes in the lessons below.