Taxiing is the movement of an aircraft on the ground, under its own power, in contrast to towing or pushback where the aircraft is moved by a tug. The aircraft usually moves on wheels, but the term also includes aircraft with skis or floats.
Jet airliners taxiing
A privately owned Sea Vixen taxis back from an air show flight, with wings folding as it moves.
A Eurocopter EC120B hover-taxis
A taxiway is a path for aircraft at an airport connecting runways with aprons, hangars, terminals and other facilities. They mostly have a hard surface such as asphalt or concrete, although smaller general aviation airports sometimes use gravel or grass.
F-22 Raptors taxiing at Elmendorf AFB, Alaska, US
Aircraft taxiing to runway, at Dubai Airport
A taxiway crossing the Autobahn
Taxiway at Munich Airport