"The Most Interesting Man in the World" is a fictional character created for a popular advertising campaign by Dos Equis, a Mexican beer brand. The character is portrayed as an older, charismatic man who has led an adventurous and extraordinary life, often sharing humorous anecdotes about his experiences. The campaign, which began in 2006, features the tagline, "I don't always drink beer, but when I do, I prefer Dos Equis." The character became a cultural icon, known for his suave demeanor and memorable quotes, contributing to the brand's popularity and recognition in the competitive beer market.