AOL, originally known as America Online, was a pioneering internet service provider and web portal founded in 1985. It played a major role in popularizing email, instant messaging, and online communities during the 1990s and early 2000s. After merging with Time Warner in 2001, AOL transitioned into a digital media company. Today, it operates as part of Yahoo under Verizon's ownership, focusing on online content, advertising, and technology services.