This document discusses food packaging and outlines various types and characteristics of packaging materials. It defines primary, secondary, and tertiary packaging. Primary packaging directly contains the product while secondary packaging groups primary packages and tertiary packaging is for bulk transport and storage. Common food packaging materials include plastic, cardboard, glass, metal, and cartons. Packaging provides physical protection and acts as a barrier from environmental factors for food. It also provides marketing, convenience, security, and tamper resistance functions. Packaging design considers factors like product contents, application, stability, and regulations.