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"Lateral reading is a strategy for investigating who's behind an unfamiliar online source [and whether their facts, claims, and evidence are legitimate] by leaving the webpage and opening a new browser tab to see what trusted websites say about the unknown source [and its facts claims, and evidence]" (Stanford SHEG's COR curriculum). Lateral reading should be used to answer both of the following questions:
A longer and funnier video from Crash Course: Navigating Digital Information explaining Lateral Reading
Demonstration of Lateral Reading by Mike Caulfield
Caulfield is a research scientist at the University of Washington Center for an Informed Public and the developer of the SIFT method for information evaluation.