A gadget review entails analyzing an article's technical correctness and thoroughness and, if necessary, revising it. There are more gadget reviews than one can count. They have become popular in newspapers and magazines around the world because they are easy to write about products that most people need but not too many people know much about. Gadget reviews are different from product tests in that they focus on describing a product's features and how well they work together rather than evaluating its performance under specific conditions. As such, they are a useful tool for comparing similar products or services with different manufacturers or providers. For example, two of the most widely read gadget reviews are David Pogue's reviews for The New York Times website. These cover a range of digital devices including laptops, smartphones, tablets, and video games consoles. In addition to written reviews, some publications will also publish photos of products featured on TV shows or in commercials. These are called "in-house" ads or promotions. Sometimes these are done by the company who made the product (for example, BMW did an ad for its new X5) but sometimes they are done by third parties (such as Ford's recent in-house ad). In any case, these ads help spread the word about new products before they are even available for sale!