's (NASDAQ: GOOG) (NASDAQ: GOOGL) Google is often considered the 800-pound gorilla of the advertising market. The tech giant owns the world's largest search engine, the most popular streaming video platform, and a massive ad network that extends its reach beyond its core websites. A whopping 39% of all digital advertising spending worldwide flows to Google's ecosystem, according to Statista.

The growth of Google's advertising business has turned Alphabet into one of the world's largest companies with a massive market cap of $1.9 trillion. Alphabet's stock might still have plenty of room to run, but its ad sales have certainly cooled off in recent years as it's faced a litany of macroeconomic, regulatory, and competitive headwinds.

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Source Fool.com