Your internet won’t get faster just because your Ethernet cable got pricier.
An Ethernet cable lets you physically connect your computer to the internet. Ethernet connections are almost always faster than WiFi connections and are usually more stable. You'll need to connect one ...
Some (many?) HDMI cables can also carry Ethernet over HDMI. The main use seems to be to provide internet connection to a smart TV from a cable modem box. Currently I have an ethernet-USB adaptor ...