What is skepticism? I found this description of skepticism by the UK Skeptics quite clear. Be sure to click through to the link for more information, including common myths about skeptics.
Skepticism is an honest search for knowledge. It is an approach to claims akin to the scientific method. It is a powerful and positive methodology (a collection of methods of inquiry) that is used to evaluate claims and make decisions. It is used to search for the (provisional) truth in matters and to make decisions that are based on sound reasoning, logic, and evidence. Skepticism is based on a simple method: doubt and inquiry. The idea is to neither initially accept claims nor dismiss them; it’s about questioning them and testing them for validity. Only after inquiry does a skeptic take a stance on an issue.
1. a branch of knowledge or study dealing with a body of facts or truths systematically arranged and showing the operation of general laws: the mathematical sciences.
2. systematic knowledge of the physical or material world gained through observation and experimentation.
3. any of the branches of natural or physical science.
4. systematized knowledge in general.
5. knowledge, as of facts or principles; knowledge gained by systematic study.
6. a particular branch of knowledge.
7. skill, esp. reflecting a precise application of facts or principles; proficiency.
Scientific Method: The scientific method is the process by which scientists, collectively and over time, endeavor to construct an accurate (that is, reliable, consistent and non-arbitrary) representation of the world.