A nested for loop (one loop inside of another loop) can be used to loop through all of the items of a 2D array since you can determine how many rows and columns are there in the array.
The most popular data type for storing text is a string of characters. A string can also contain numbers and symbols, although they are always regarded as text. The most common way to save a phone number is as a string (+1-999-666-3333), but it can also be kept as an integer (9996663333). The number of strings plus one determines the second dimension. plus one extra for the null character, up to the length of the longest string.
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