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Azo dyes have a long history and establish a significant constituent in our daily lives. These compounds and their derivatives have several potential applications in different fields, including industry, environmental and biological researches. Different azo compounds were successfully modified to other derivatives, complexes, and polymers. In this work, we reviewed the chemistry and applications of azo dyes investigating organic chemistry of azo dyes, inorganic chemistry of azo dyes, analytical chemistry of azo dyes, and azo dyes-polymers.