I have stolen this shamelessly from Steven Novella of the Skeptics Guide to the Univere among many other platforms, via the good folks at Leicester Skeptics in the Pub. The original article is available here, and is an excellent summary of what the skeptical approach looks like.
A skeptic is one who prefers beliefs and conclusions that are reliable and valid to ones that are comforting or convenient, and therefore rigorously and openly applies the methods of science and reason to all empirical claims, especially their own.
A skeptic provisionally proportions acceptance of any claim to valid logic and a fair and thorough assessment of available evidence, and studies the pitfalls of human reason and the mechanisms of deception so as to avoid being deceived by others or themselves.
Skepticism values method over any particular conclusion.
pixie359 is also currently writing a post about the use of labels in the skeptical and related movements, which may end up here if it seems useful.