The final result will look similar to this when opened in a plain vanilla text editor:
So now you know why its "comma" separated...however to be more generic, people can be a little uneasy with that character, hence they resolve to use some other character like a tab ('\t'), or a pipe ('|'), etc.
Hence to be more generic we should be calling this pattern of data storage Delimiter-Separated-Value or DSV. This pattern of storage is meant to store tabular data via a series of delimiters (to separate columns) and row-terminators (or line-terminators).
Now comes the more tricky problem...
Imagine there is program that would parse dsv files given its delimiter and row-terminator. You are only provided with a dsv file with no knowledge of the above two things...how do you write a program to find those two things out?!
Drop in a comment if you happen to figure this out or if you want an answer to it.