David Filo is an American entrepreneur and computer engineer best known as the co-founder of Yahoo!, one of the early pioneers of the internet. He started Yahoo! in 1994 with Jerry Yang while they were both graduate students at Stanford University. The website initially began as a directory of websites and quickly grew into a major internet portal. Filo has played a significant role in the development of internet technology and online services. After Yahoo! went public in 1996, it became one of the most visited websites in the world. Filo has also been involved in various philanthropic efforts, supporting education and technology initiatives.