by For most of us, Wi-Fi has become our preferred way to connect our Macs to other networked devices and the Internet. However, most of us also have times when those connections slow down or fail altogether. When that happens, however, there are several things you can do to diagnose and (ideally) fix the problem.
Signal and noise
The thing to remember about Wi-Fi is that it’s a form of radio: Signals are passed to and from your Mac and your router (and any other networked devices) by transmitters and receivers at both ends tuned to the same frequency. While the information being sent might be digital in nature, the medium it rides on is analog. As such, the ability to transmit and receive data via Wi-Fi is dependent on two things: the strength of the signal between those transmitters and receivers; and the volume of interference—unusable “noise”—from other devices using that same frequency.
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