What are the four application of Internet?

Could you elaborate on the four primary applications of the Internet, and how they have transformed our daily lives? I'm particularly interested in understanding how these applications have disrupted traditional industries and created new opportunities for individuals and businesses. For instance, has the Internet enabled a more globalized marketplace? How has it facilitated communication and collaboration across vast distances? Additionally, how have the Internet's applications impacted education, entertainment, and the way we access information? I'm keen to hear your insights on these topics.