Pseudoscience refers to claims or practices presented as scientific but lacking valid scientific methodology, supporting evidence, and testability. Key characteristics include a lack of empirical evidence, absence of peer review, non-falsifiability, exaggerated claims, use of jargon, and resistance to criticism. Examples of pseudoscience include astrology, the anti-vaccination movement, and flat Earth belief, emphasizing the necessity of critical thinking and scientific literacy to differentiate them from legitimate science.