* Philosophical skepticism - a philosophical position in which people choose to critically examine whether the knowledge and perceptions that they have are actually true, and whether or not one can ever be said to have absolutely true knowledge; or
* Scientific skepticism - a scientific, or practical, position in which one questions the veracity of claims, and seeks to prove or disprove them using the scientific method. From Wikipedia. Click here to read the full entry.
There is a difference between "skepticism" and "relativism"
Relativism: "Relativism is the view that the meaning and value of human beliefs and behaviors have no absolute reference. Relativists claim that humans understand and evaluate beliefs and behaviors only in terms of, for example, their historical and cultural context. Philosophers identify many different kinds of relativism depending upon which classes of beliefs allegedly depend upon what." Click here for Wikipedia article on Relativism.