The flare is the act of pulling both toggles down together in the last moments before landing. It deflects the canopy's tail, trading forward speed for lift, and slows both descent and forward motion for touchdown.
Why it works
A canopy in normal flight descends while moving forward. Deflecting the tail increases lift briefly, flattening the flight path and slowing the canopy — for a short window, before the energy is spent and it begins to sink again.
Landing well means arriving at that window at the right height. Too high and the canopy runs out of energy and drops; too low and there is not enough time for the flare to take effect.
Conditions change it
Wind, wing loading, canopy design and density altitude all shift the correct height and rate. A landing that works on a cool sea-level morning behaves differently at a high-altitude drop zone on a hot afternoon — one reason jumpers are cautious visiting unfamiliar DZs.
These pages explain what things are so the language makes sense. They are not instruction and cannot substitute for it — skydiving is taught in person by rated instructors at a drop zone, and anything involving equipment handling or emergency procedures belongs there rather than on a web page.