Ethernet is a type of cable. You can connect it to your computer to connect to a modem, or you can get a wireless router to use instead. You will need a wireless card (usually built in to any computer made within the last 5-10 years).
Ethernet can run up to 100 meters with no loss of signal. Any longer than that will need an active signal booster.
Yes, you will definitely get a much better internet signal if you have a USB Ethernet adapter for your laptop in a Wifi area. It would help very much.
Ethernet
there are different network media,fiber,copper cable etc.to make communication in different media,need the media converter,for example,fiber media converter making the copper ethernet over fiber transmission,E1/ethernet converter making the ethernet over E1 conversion.
Yes,,,,, if you mean, if you can hook up a Web type camera via the Ethernet cable and receive the signal. Most outdoor cameras have an ethernet hook up to allow that.
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The ethernet helps you surf the internet faster
Repeaters
It you can pick up Internet signal without hooking an ethernet cord into your computer. You can get the wireless signal in the wireless routers range.
10GBase-ER
coaxial
Its a media cabinet for new home installs, with built in Ethernet media networks.