The document discusses comparative advertising techniques used by companies to promote their products over competitors. It provides an example of Procter & Gamble launching a new Tide product, which threatened Hindustan Unilever's market share for their Rin brand. In response, HUL launched a new double whiteness Rin and an ad campaign claiming it was better than Tide at an affordable price. P&G took legal action against HUL for the comparative claims.