Primary packaging refers to a product's immediate container, like a plastic packet or bottle. Secondary packaging provides additional protection, like a cardboard box around toothpaste. Transportation packaging is for storage or delivery between locations, such as 50 pens packed in a case and 50 cases in a box. Packaging serves several functions - identifying products, protecting goods, attracting customers, differentiating brands, offering convenience, and preventing tampering or adulteration. It is a critical part of marketing and distribution.