Critical thinking has existed as a valuable part of the education system for such a long time in form of questions which later turned to a new norm- a way academic instructor uses to test the critical thinking ability of students. If you are a student who is expected to write a critical thinking essay, then you have lots of work ahead which will require knowledge, skills and expertise. But right before we even go there, you need to understand what is critical thinking essay and students need to hire critical thinking to complete it.