The client, represented by a laptop, connects to the internet via a wireless network connection(in the figure above). Data transmission between the client and the wireless router goes through a medium where the waves are transmitted and received. The other type of connection is a physical link. The actual wire connects to a router and is then connected to the internet using similar means to accomplish the same goal.
Fiber optic though expensive and difficult to install and maintain, has the best possible bandwidth allowing many Gigabytes of data to be transmitted at literally the speed of light. Wireless, though convenient and reliable is easily hacked and or capable or being eavesdropped upon allowing for serious security issues. Wired using coaxial or twisted pair is more secure although the bandwidth for each is different and reduced.
From the router, an internet connection is maintained by an ISP or internet service provider, where for a monthly fee end users gain high-speed access the World Wide Web. The Internet hub as depicted after the wired link often fiber optic cabling (not wire) links the wired or wireless router to the internet and beyond. From there the client can access a secured or unsecured server represented by the last server box at the end of the diagram. When this happens as represented by the top curved arrow the client requests information or an action of the server and the server responds to the request represented by the bottom curved arrow.
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