StringBuilder is used to represent a mutable string of characters. The string will be something mutable, but it can easily be changed. String objects are immutable, but StringBuilder is the mutable string type. There is no need to create a new instance of the String object but will provide the needed modifications in one particular string object.
StringBuilder is considered to be faster, especially whenever you need to make a few changes. String and StringBuilder are almost similar to each other, but the small differences can make people choose one type over the other depending on the type of objects that they need to work on and the processes that they want to do.
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