What is the difference between string and StringBuilder in c#?

String

• It’s an immutable object that hold string value.
• Performance wise string is slow because its’ create a new instance to override or change the previous value.
• String belongs to System namespace.

StringBuilder

• StringBuilder is a mutable object.
• Performance wise StringBuilder is very fast because it will use same instance of StringBuilder object to perform any operation like insert value in existing string.
• StringBuilder belongs to System.Text.Stringbuilder namespace.