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/*
In C#, string is a built-in reference type that represents a sequence of
Unicode characters, while StringBuilder is a class in the System.Text namespace
that provides a mutable (modifiable) string of characters.
Here are some key differences between string and StringBuilder in C#:
string is an immutable type, which means that once a string object is created,
its value cannot be changed. In contrast, StringBuilder is a mutable type,
which means that its value can be modified after it is created.
string is stored on the managed heap and is reference counted, while
StringBuilder is stored on the managed heap or the stack (depending on its size)
and is not reference counted.
When you concatenate or modify a string, a new string object is created to
hold the resulting value, while StringBuilder modifies its existing value
in-place.
string provides methods for creating and manipulating strings, such as
Substring, IndexOf, and Trim, while StringBuilder provides methods for
modifying its value, such as Append, Insert, and Replace.
In general, string is suitable for working with small, fixed-size strings,
while StringBuilder is more efficient for working with large, dynamic strings
that need to be modified frequently.
*/