Classification is a way in which we can associate different topics or materials in order to make our lives easier. Just look at the classification system in Biology, without it trying to comprehend and search for a certain species would be downright impossible. There are so many things we have to keep track of that simply would not be possible without a system in place that allows for simple access or navigation.
Of course, the act of classification can be rather tricky. There are so many things to keep track of and so many similar products that putting each into their own category is not a simple task. This why we need things like metadata or having people dedicated to solely working with classification. Imagine if keywords did not exist when trying to search for something online, you could probably find a lot of information but how much of it would actually be relevant to what you are specifically searching for?
Think of how we look at other people, we classify them by gender, by race, by residency, by physical features, by personality traits. Classification is important because it is something basic and ingrained into us, it makes our life simpler and we do it with everything.
