Dynamic climbing rope stretches when it is loaded, so for a climber this means that when he falls, the rope will stretch a little as weight is applied, making a fall softer and safer.
A static climbing rope does not stretch and has its advantages in situations where you need a rope that does not stretch or give, such as rappelling or caving use. A static rope should not be used by climbers who are lead climbing because taking a fall on a static rope can lead to serious injury to the climber or even cause the rope to snap as it does not properly absorb the force it needs to cushion a fall.
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