indoors or outside, depends on the kite model applied and your objective(s). You actively fly 'em, like a sport kite, some have superior negative glide capabilities (Janus by Bill Biggie), some float on a fart (iFlight), some you'll "add weight to" in an effort to alter the glide (Manta, up to a pound!) some are compound shaped like the 61/49 by McNeill and need some slight breeze, .... Skate glider kite can fly unattended if there's even enough to feel on your neck~kind of wind
glides are single lined kites, but all single line kites are NOT gliders