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Search Engine Optimization (SEO) began in the 1990s when search engines first emerged, with early techniques including keyword stuffing and meta tag optimization.

Google's PageRank algorithm, developed in 1996, revolutionized SEO by ranking pages based on the quality and quantity of links pointing to them.

Modern SEO focuses on user experience, content quality, and technical factors like page speed and mobile-friendliness, rather than just keyword optimization.