With a PhD, you push at the boundaries of human knowledge in your field for years through research and study, until making your own unique contribution in the form of new findings or insights that expand what is known. The PhD journey involves starting with general knowledge and specializing through different levels of education, before focusing intently on exploring and challenging the existing limits of understanding in a particular area. Earning a PhD changes your perspective as you come to see your small contribution in the wider context of all human knowledge.