What do you mean "the type of strings"? In pretty much every programming language, String is one of the most fundamental types. There's no "different types of string".
(yes, this is a joke, a bad one at that. badum tish)
(yes, this is a joke, a bad one at that. badum tish)
Python has byte strings, Unicode strings, format strings, regular expression strings, and probably a few others!
Rust has str and String, depending on ownership.
Why I hate Rust
(Also a bad joke.)
[1] https://developer.apple.com/documentation/swift/substring