The Real Poop Taxonomy is an intimidating term associated with an area of biology which is generally considered tedious even by biology geeks. The reputation is not really deserved there's more to this than meets the eye. The idea really isn't that mysterious. Taxonomy is simply the name for the practice of classifying organisms.
Humans classify compulsively.
Consider the myriad ways we classify ourselves. There's the vast, complicated family classification system, then there are cultural class systems and socioeconomic systems and even the anachronistic racial systems. When the body of objects to be classified includes all living things, the classification problem is immense. There have been a lot of attempts to sort out and make sense of the dizzying diversity of life. For example, Aristotle made one of the early attempts.