An array that uses a single subscript is called a one dimensional array. This is because one index is used to access the values in the array. Its cells are like numbered boxes lined up one after the other in a line.
A two dimensional array requires two indexes to access values. Its cells are like boxes arranged into a rectangle. Arrays of even higher dimension are possible, although rarely used. This chapter discusses typical ways to use one dimensional arrays.
How could you print out every element of an array with 100 cells?