Since CSV means comma separated values, the format is value1, value2, value3, and so on.
Although it says comma, the character that seperates the values can be one of many characters.
This may take the form of any data:
size, style, color, length.
12,retro,blue,35inches
or
size; style: color; length
12;retro;blue;35inches
write it in a text file, save it, and change the name to "whatever.csv"
The real trick is the importing mechanism that you use.