A mag or magneto is a coil of wire that is "excited" by a permanent magnet thereby inducing a high voltage to fire the spark plug with. Most single cylinder lawnmowers use mag and point systems to fire the plug. Coil is hard mounted and the permanent magnet is part of the flywheel with the points mounted under the flywheel.
A coil is a two coils of wire, one is connected to ground on one end and the other end is connected to either a set of points or an electronic switch, either of which turns on and off the current through that coil. When the coil discharges its electrical potential, its magnetic field collapses, inducing a high voltage in the other coil which is used to fire the spark plug.
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