In this section, we use a similar technique to solve the sorting problem, that is, starting with an unordered array of elements and rearranging them into non-decreasing order.
This line is taken from a coding textbook where they are basically discussing sorting algorithms. Sorting algorithms either sort in an increasing order or a decreasing order depending on the input type.
Does the word non-decreasing here mean same as that of increasing? Is there any particular situation where they have different meanings? Also, can these two words be used interchangeably in a context?