Difference between String and StringBulider

Description:- 

In this article I will explain difference between String and StringBuilder in C#.

String:-

String is immutable (Unchangeable). Immutable means once we create a String object we cannot modify it. Any operation like insert, append and replace to change string it will discard the old value and it will create a new instance in the memory to hold the new value.  

StringBulider:-

StringBuilder is mutable (Changeable). It means once we create StringBuilder object we can perform any operation like insert, append, and replace without creating new instance for every time.

Differences:- 

1. Performance wise String is slower than StringBuilder because every time string will create new instance.

2. String belongs to System namespace whereas StringBuilder belongs to System.Text namespace.