Hey, that's pretty neat. Arrays get even better. They can also hold letters. When they hold letters we call them strings. They aren't as useful in the same sense as arrays of numbers, but they are good at holding sentences all in one place rather than each letter in a separate variable.
Strings look a lot like arrays.
The only difference from numeric arrays is they have a char data type. You need to do that so the computer knows when the array is finished. It is actually used by things like cout which checks every letter. It just means 0. Plain and simple.