The phrase you seek is called “Layman’s Terms” as defined: https://www.merriam-webster.com/dictionary/layman%27s%20terms https://www.merriam-webster.com/dictio

The phrase you seek is called “Layman’s Terms” as defined: https://www.merriam-webster.com/dictionary/layman%27s%20terms https://www.merriam-webster.com/dictionary/layman%27s%20term... This avoids classification of the reader. To refer to someone who lacks the knowledge of a domain, they are a “layman”.