A Set is a data structure called a collection, and a Map is a data structure called a dictionary.Both sets and dictionaries can store unique values, which are convenient for deduplication. Sets store elements in the form of [value, value], and dictionaries store elements in the form of [key, value].A Set can hold any value of any data type. Let's first briefly understand the properties and methods of the collection, and then study the specific use of this collection.