Professors are self-proclaimed intellectuals who are failures in the professional world.
While the supposed job description of a professor entails teaching, in actuality most professors know absolutely nothing about teaching. However, many professors will not hesitate to take a
student's tuition money, not teach him
anything, and then
test him on what he was never taught.
The other main activity of a professor is embezzling money (that could have been
spent on useful things) for their own "research". Usually, this "research" involves topics that nobody outside of academia will
ever care about or find a practical application for.
Take solace in the fact that your professors earn a miserable salary in proportion to the level of education they have attained.