Smart Switch is a canned utility of Samsung for creating backups of modern Samsung devices. Smart Switch replaced Kies, which is currently used to create backups of older Samsung devices. The specific feature of Smart Switch is that it can be used for data extraction from a Samsung device even if the USB Debugging function is not activated in the device. As a rule, Smart Switch is used when there is no other way to extract data.
Go to the web-site of the program (https://www.samsung.com/us/smart-switch/). There you can find versions of the program both for PC and for MAC available for downloading. Select the version you need and click on it. When the program is downloaded, double-click on the downloaded file. The installation of the program will start.