Glossary

For all those non-aviation speaking people, a quick glossary:

VFR	Visual Flight Rules
	When visibility, cloud, etc permits, operating in accordance with a specific set of rules. This is the 'basic' set of rules that everybody learns initially.
IFR	Instrument Flight Rules
	When visibility deteriorates, through cloud, rain or sometimes through smoke, aircraft need to operate according to these rules, to ensure your plane is navigated adequately, separated from other planes that can't be seen, etc, etc. Requires an addition to the basic licence (called a 'rating')
ILS	Instrument landing system
	A 'precision navigation aid' that will guide you in to land, through cloud, to within about 300ft of a runway.
RNAV	Kinda short for 'Area Navigation', but basically referrers to using a GPS, either to navigate between places, or for an RNAV approach, to land at a particular place.

Cessna C210

Looks like this:

Cessna C310

Looks like this:

Cessna C402

Looks like this: