A group of similar products that differ only in relatively minor characteristics is called a product line. A product line cam be defined as a group or set of similar products manufactured and sold under a one brand name and a same company.
A single organisation can have different product lines. Product line can vary from color, size, type, prize and so on. For example - Coca-cola company sells juices of various flavors like mango, orange, guava etc. under a single brand name Minute Maid and under a same company Coca-cola.
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