The document discusses the concept of cannibalisation in business, defining it as one product of a brand consuming the market share of another product within the same brand. It highlights strategies such as line extension and brand extension while presenting successful examples from companies like Hero Honda, Toyota, and Apple, emphasizing that cannibalisation can be a beneficial strategy for maintaining market share and encouraging innovation. Ultimately, the document argues that cannibalisation prevents brands from falling behind competitors and aids in growth.