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Lesson 4, “Protocols,” covers the problems that protocols were designed to solve, how to implement protocols in code and how to create protocols. Viewers learn about the formal Protocol design pattern. They learn how to use formal protocols within their own classes and how to declare that a class implements a specific protocol. Viewers learn how to create their own formal protocols and how to use those protocols in their own code. Finally, viewers learn about the concept of informal protocols and how to use them.