字典非常熟悉有关此代码的问题。这种代码称为什么?

我只是喜欢研究更多的东西,而不是Swift编程的基础知识,而且实际上注意到字典非常熟悉。如果您知道的话,您想向我解释一下这些代码编程的真正含义和名称吗?

代码结果:

// MARK: Dictionaries
var Weather = [String: String]()
Weather["Sunday"] = "Sunny"

// MARK: What does this with angle bracket syntax is called?
// Notice: It's seems familar to Dictionaries.
var Total_Miles = Dictionary<String, Int>()
Total_Miles["Antonio"] = 100

谢谢您带来的帮助! :)