A niche is a specialized market or area of interest within a broader industry or sector. In the context of advertising, a niche can refer to a specific demographic, interest, or consumer group that is targeted by a particular advertising campaign. Niche advertising refers to the practice of targeting and reaching a specific and specialized audience, rather than a broad and general audience. Niche advertising can be effective for advertisers who want to reach a specific and relevant audience, and who want to deliver value and relevance to their target audience. Niche advertising can also be beneficial for publishers and platforms, as it can help to maximize the value and revenue of their ad inventory, and to provide a better user experience for their audience.