
To see which Mac and macOS you have click on the Apple icon on the top right hand part of the screen and then click “About This Mac” in the drop-down menu. MacBook Pro introduced in 2011 or earlier

MacBook Air introduced in 2011 or earlier The following computers cannot run macOS 10.14 Mojave or higher and should be replaced by the end of the year: That means if you fail to replace your Mac or upgrade your macOS to a newer version by November, you would be putting your data at risk due to less advanced security.

Ad tracking protection: You may already know that many websites track your activity in order to deliver targeted ads.Mail app improvements: If you use the built-in Mail app for email, you'll be able to keep it open without slowing down other apps because the new version will use 35 percent less disk space.According to Apple, it will be able to run JavaScript 80 percent faster than before. Safari speed improvements: The built-in Safari web browser will be faster than previous versions.Rather, it will allow your computer to access files much more quickly, leading to a noticeable improvement when moving or copying files. Because this is a back-end change, it won't change the way your files and folders are organized. File system: macOS High Sierra will use a new file system called Apple File System (APFS), which will replace the current Hierarchical File System Plus (HFS+).

Most of the changes are designed to improve the speed and efficiency of your computer. The look and feel of High Sierra is very similar to Sierra. You cannot purchase a physical copy at a retail store. As with previous versions, macOS High Sierra is only available as an online download.
