In C programming, a string is a sequence of characters terminated with a null character \0. A string in C is stored as an array of characters, and the difference between a character array and a C string is that the string is terminated with a unique character \0. Declaring a string in C is as simple as declaring a one-dimensional array. The basic syntax for declaring a string is `char string_name. There is an extra terminating character which is the Null character (\0) used to indicate the termination of a string that differs strings from normal character arrays. Strings can be initialized in different ways. The C language does not provide an inbuilt data type for strings, but it has an access specifier "%s" which can be used to print and read strings directly.