The definition of a string would be anything that contains more than one character strung together. However, single characters will not be strings, though they can be used as strings.
Strings are arrays of chars.
Static strings are words surrounded by double quotation marks. Do not forget that arrays begin at zero, not 1 for the index number. However, just remember that there will be an extra character on the end on a string. It is like a period at the end of a sentence, it is not counted as a letter, but it still takes up a space. Technically, in a fifty char array you could only hold 49 letters and one null character at the end to terminate the string.