Answer / dsr

string is immutable.String and StringBuffer both are
classes.stringbuffer is mutable.

Answer / akash

using String
if u want to append the text then u prefer's this thing
string strTemp="a";
strTemp=strTemp+"jay";

But in case of StringBuilder
if u want to do the samething then u will get a append() function.

Answer / vinodh kumar

Though string looks like mutable(the value can be changed once after initial value) but string is not mutable. Every time you modify the string a new object reference will be created and it will gets updated. StringBuilder is mutable.

In situations like you want to concat strings in loopings, we'll use StringBuilder.

In loops like for, for each, while, etc., using string for concatenation it will give negative performance.

Conclusion:
-----------
String is Immutable.
StringBuilder is Mutable. For performance reasons during concatenation operations in string in conditional looping statements we use StringBuilder.
http://msdn.microsoft.com/en-us/library/system.text.stringbuilder.aspx

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