The traditional focuses of sociology include social stratification, social class, social mobility, religion, secularization, law, sexuality and deviance.
These were called calceus mulleus, and the name may have been shortened to mules by English speakers. Hence the primary difference between mules and clogs in early days was that clogs were likely to be worn by working people, and mules were fancier and favored by the aristocracy.
There are minor differences between mules and hinnies. Hinnies are produced by breeding a horse stallion to a donkey jennet. Where as Mules are the other way around, being produced by breeding a donkey jack to a horse mare. So in general: