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Wifi is often confused with wireless.  This is because Wifi is a type of wireless connection, but it is a specific type of wireless connection.  A wifi connection, on its own, does not provide access to the Internet.  It only provides access to a local network.  That network then has to be connected to the Intenet trhough some other connection in order for you to get Internet access over a Wifi connection.

To get a Wifi connect to the Internet you need 3 things.  First, the device you wish to connect via Wifi has to have Wifi hardware in it.  Phones, tablets and laptops all have this hardware these days.  Desktop computers may or may not.  Second, you need to have a router with Wifi built in.  It MUST be a router.  If your modem has wifi capabilities that is because your modem also has a router built into it.  And finally, the router you are connected to needs a connection to the Internet.

The maximum range of a Wifi connection is listed a 1,155 feet, though this range is affected by many things and almost always falls far short of that.  There are also currently 2 different Wifi technologies, 2.4GHz and 5GHz.  That number describes the carrier frequency the Wifi signal travels on and each frequency has benefits and drawbacks.  Many modern routers broadcast Wifi signals in both ranges and you can choose which one to connect to, assuming the device you are connecting can connect to either one.  Newer phones, tablets and laptops can connect to both.

The 2.4GHz bandwidth boasts greater range.  Lower frequencies penetrate walls and floors easier.

The 5GHz bandwidth boasts faster speeds.  On top of that, being the newest technology, there are far fewer 5GHz Wifi connections out there than there are 2.4GHz connections.

Each network connection can run on a variety of "channels".  The channel your Wifi is set on is usually chosen automatically for you by your router and you don't need to worry about it.  But an area can become "cluttered" with Wifi signals.  Unfortunately Wifi signals interfere with each other.  The more signals there are, the worse the wifi connection is.  That is why there are different channels.  There is some overlap between the channels as well.  2.4GHz Wifi, for example, has 11 channels (actually there are 14, but only 11 may be used in North America).  A Wifi signal on channel 6 will interfere slightly with Wifi signals on channels 5 and 7 (and others to a lesser extent), but is much worse for other Wifi signals on the same channel.  This makes the less cluttered 5GHz range even faster since it doesn't have to compete with your neighbors for "airspace".

When choosing which one to connect to I recommend connecting to both with the 5GHz Wifi being prefered.  Since the 2.4GHz signal travels further, when you're out of range of the 5GHz signal the 2.4GHz signal will then connect.

There is one important thing to note, however.  Cheaper routers may be able to do both, but not at the same time.  To produce signals in both ranges simultaneously requires that the router have 2 radios built in.  If the router has only a single radio you get one or the other, not both.  Netgear is a great brand name for network equipment which is not too expensive.