Question: What is wireless Internet access?
Wireless Internet access usually means you can access to Internet directly and wirelessly by subscribing to wireless broadband access service provided by ISP. In this case, you can connect to the Internet via the service provider provided USB dongle that can be inserted to the laptop, or via modem router that can be connected to it from laptops. This type of Internet access is getting common with the advent of 4G and 5G cellular technology.
It can also means you get Internet access by connecting your computer to public hospots or wireless network that links to Internet with DSL/Cable broadband service. It's common nowadays as there is built-in wireless adapter support on majority of laptops. You can also take a look here on various wireless adapters that can be used to connect computer to wireless network.