What is defending a dissertation?

Answer 1

A student must write a dissertation and defend it as part of the course study to obtain a graduate degree. This compilation is expected to elaborate on a new concept needed, used, or encouraged for an identifiable subject, and have extensive legitimate documentation. One accomplishes the task by introducing new knowledge found through research, or experimentation along with possibly a new theory on how to apply the new concept. Then when the student has finished the dissertation he/she must present it to a group or committee whereas the student must argue his/her points of contention as to the new concept that is being presented.

Answer 2

Defending a dissertation is a process in which PhD candidates give a presentation on their completed dissertation (which is a PhD level thesis). After the presentation, anyone in the room is allowed to ask questions about the project. The PhD candidate then has to respond to those questions. In essence, the student "defends" the merit of the work. Passing the defense is the very last step before the student's committee members award their student the PhD.