right so in this video we're gonna understand how information travels wirelessly and what i mean by this is that we're gonna understand how devices like wifi wireless internet work how things like radios same cars work and how things like cellphones which definitely use wireless communication how they work and the reason that we can understand all these in one pretty short video is that they all use same principle of communication: they all use communication via waves so waves are in the world intimately familiar with we know you know from childhood that we have say a lake and someone throws rock into this lake then the rock is gonna cause ripples to form in the lake and the key point about these ripples what makes them called waves is that they move; they propagate and because it propagates they can carry information out about the initial disturbances that created them for example the way that you're listening to my voice right now is that your speaker it is a very poor drawing but your speaker is moving and your speaker is creating sound waves and a sound wave is just rhythms of high and low density in the air this is supposed to be chemokines and so the sound waves reissue you and new year some complicated process to transfer that into sound but again these waves disinformation pensions possible because the waves propagate nabbed understand how of these devices work we're gonna have to talk about something called electrode magnetic or deanne ways and the exact nature of these waves is too complicated go into now it's not important furnish agnes was just an excuse examples of waiting or read about that are in fact he m waves