Difference between string and string builder.

1. String is immutable where is string builder is mutable..
2.In string Builder, automatically increase and decrease size of string object whenever add elements and delete elements .Where in string , it is fixed size…...
3.StringBuilder can performed a insert(),Delete(),Reverse(),Sort() operations etc and we can create multiple instances .Where as String , It can't perform .
4. StringBuilder takes enough memory for variable .Where, as String can't perfume