API stands for application programming interface. APIs let your product or service communicate with other products and services without having to know how they're implemented.
There are Tons!!! of Free/Public APIs available by a very simple google search. Using APIs you can get access to thousands of information that you would have never been able to access. From Free News Sources, To Animal's Information, to pure entertainment APIs such as the Star Wars API used in the Video Tutorial.
If You are wondering how you can Use the Power of APIs in SwiftUI then look no further. This short tutorial will show you exactly how to do so :)