Nominal data = qualitative ... ex "red, blue, green " "male, female" "cat, dog"
Ordinal = quantitative .... ex "speed of the internet, your grade, income"
You cannot order the nominal datas.. so like , red > green? no.. blue > green? no... doesnt make sense right?
on the contrary, you can arrange an order for ordinal since its quantitative.. 15mbs internet > 12mbs.. 18k income > 12k income.. etc..