So transistor is composed off thin layers of semi conducting material either made of silicon germanium. Or nowadays it can be made from any other compound, which acts that semiconductor on in transistor. Particularly, there are three layers semiconductor, which is called emitter, a base on dhe collector, so it can be either N, p, n, a, p and p transistor, as you can see here and here and means that it end means that it is doped with phosphors or arsenic. So it's a mixture of silicon, plus fours for us or silicon, plus acidic and P means that it can be mixture of silicon plus border on there can be other doping, says Well, so this is the primary example of that. So this is transistor for you. It can be in p n, o. P, M. P. As needed in application. Now, transistor here can act as amplifier. The switch. It can do so by controlling the flow of electrons from based emitter and base to collector. So when you apply some particular signal between emitter on the base, let's say it's the audio signal on you. Collect the output between base and collector, which is again audio signal, but it will have higher amplitude. So if this is a very low amplitude signals, this will be very high. Amplitude signal. That's how it works as an amplifier, on the other hand, to make it work as a switch, there is a current flowing from base, So this is a sort of a collector to emitter, and there is a current applied to base. So a small current which controls the base can control the current flowing from collector to emitter or emitter to collector. Uh, bye. So it can be controlled with the small current applied to the base. So that's how it can work as a switch. Thank you.