Final answer:
Wi-Fi uses microwaves to enable wireless Internet connections for devices like laptops by communicating with a wireless router. These routers follow specific standards to ensure device compatibility and high-speed access. Technological advancements have made Internet access more widespread, with smartphones playing a pivotal role.
Step-by-step explanation:
Wi-Fi, otherwise known as wireless fidelity, allows devices such as laptops and PDAs to connect to the Internet without physical cables. Wi-Fi uses microwaves in the 2.4 GHz to 5.0 GHz range to transmit data wirelessly. This technology enables high-speed connections that are essential for various online activities. Through a wireless router, connections to the Internet are made, which then communicates with devices wirelessly to exchange data. These routers adhere to specific standards that ensure compatibility across different manufacturers.
Such technological innovations have been significant, particularly after 2007, when smartphones like the iPhone began to offer the ability to connect wirelessly to the Internet through cell-phone infrastructure. These advancements have led to more consumer choices, cheaper and higher-quality phone services, and have facilitated the way for a more connected world. Microwaves are particularly suited to communication due to their ability to carry large amounts of information over long distances, provided there is a clear line of sight between transmitter and receiver.