What is the difference between String and Character Array?

String  have static storage duration, While character array not, unless it is specified by using the static  keyword.
Moreover a string is a character array having properties: 

• the sequence of character, generally call string, is  an array .This array contain all characters plus a NULL character.
• we cant modify it.
• two string having same value may share same memory .

DECLARATION: 

char a[ ] = "Kumar and Bucky”; Character Array 

char *s = “Calvin and Hobbes”;     String