Lateral reading is basically searching for information about a source while you are reading it; you are checking for currency, relevancy, authority, accuracy, and purpose (CRAAP method) by reading what other sites say about your source. This is different from vertical reading where you apply the CRAAP method using only the information the site itself provides you.
The concept of lateral reading originated out of research from the Stanford History Education Group (SHEG) under Sam Wineburg, the founder and executive director and is used by professional fact checkers!
Watch this video from the Stanford History Education Group to learn more.
So, to read laterally:
The easiest way to understand lateral reading is to see an example, so click on the tab to your left to see lateral reading in action!