NMOS
Beginner
The kind of transistor switch that turns on when its gate voltage is high.
Novice
An n-channel MOSFET: n+ source and drain in a p-type body. A positive gate-to-source voltage above the threshold pulls electrons into a channel and turns it on.
Expert
Electron channel, so roughly 2–3× the drive of a same-size PMOS. Passes a strong 0 and a degraded 1, which is why it forms the pull-down half of a CMOS gate.