We use categorisation everywhere in our day to day lives. We use it to find items in a grocery store, to find your favourite song, or to keep school stuff away from your personal stuff. Scientist use it to classify living organisms and to classify science in general. Scientists that use categorisation to classify living organisms are called taxonomists.
People can not live with out categorisation/classification. Without it you would be finding a single can of beans next to a steak and ice-machines. Human thrive of of classification, routines are a form of classification. Now what was the point of this topic. To use classification more? To show it's importance? How ever this impacts you in your life.