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Imagine you posted online a picture of your family dog. A human might describe it as "a black, medium-sized dog, looks like a Lab, playing fetch in the park." On the other hand, the best search engine in the world would struggle to understand the photo at anywhere near that level of sophistication. How do you make a search engine understand a photograph? Fortunately, SEO allows webmasters to provide clues that the engines can use to understand content. In fact, adding proper structure to your content is essential to SEO.