From this document:
To use a reserved word as an identifier, put a backtick (`) before and after it.
The most important usage is the interaction with other languages that have different keywords.
From Swift you can call C and Obj-C functions.
Now, consider for example that you need to call a C function called
guard. However, that's a keyword in Swift, therefore you have to tell the compiler that you don't want to use it as a keyword but as an identifier, e.g.:
There are multiple keywords in Swift that are widely used as method/function names, e.g.