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Tinder is easily combustible material used to start a fire. Tinder is a finely divided, open material which will begin to glow under a shower of sparks. Air is gently wafted over the glowing tinder until it bursts into flame. The flaming tinder is used to ignite kindling , which in turn is used to ignite the bulk material, to produce a fire.  
Any material may be used as long as it is finely divided. As the tinder gets thinner, the surface area and edges increase, making it ignite more easily.
Wood tinder can be made by carefully shaving thin slivers off a larger piece. Another method which keeps these slivers together, is to make a feather stick. The driest wood, which makes the best tinder, are dead branches that have not fallen to the ground yet.