Can you tell about the key features of string data in programming?

In C#, strings (string) have several key features:

• Immutability: once created, a string cannot be changed. Any operation that modifies a string creates a new object.
• Unicode support: strings store characters in UTF-16 format, allowing work with a wide range of symbols.
• Comparison: strings are compared by content, not by reference, which is convenient for equality checks.
• Interning: the compiler can store identical string literals in one place to save memory.
• Methods and properties: the string class provides many methods for text manipulation — searching, replacing, splitting, case conversion, etc.

Example usage:

string s = "Example string";
string upper = s.ToUpper(); // "EXAMPLE STRING"
bool contains = s.Contains("string"); // true