Layman (noun)

1. A person who is not a member of the clergy or a professional in a particular field.
2. A person who is not a specialist in a particular field of knowledge or endeavor.

Origin:

Late 14c., from anglo-french leyman, from old english leġeman, from leġe (genitive leġes) "people" (see lay (adj.)) + man.

Examples:

1. He is a layman when it comes to understanding the intricacies of quantum physics.
2. As a layman, he was unable to understand the technical jargon used in the scientific report.
3. The layman's explanation of the economic recession was simple and easy to understand.
4. The layman is not aware of the technicalities involved in the process.
5. He was a layman in the field of medicine and had no knowledge about the medicines prescribed.