What are decompression stops used for?

Decompression stops are specifically used to safely release nitrogen from the body during ascent after a dive. When divers descend and spend time at depths, their bodies absorb nitrogen from the air they breathe due to the increased pressure. If a diver ascends too quickly after spending time at depth, this nitrogen can form bubbles in the blood and tissues, leading to decompression sickness, also known as "the bends."

Decompression stops allow divers to ascend in a controlled manner and pause at certain depths, giving their bodies the time needed to off-gas or release the excess nitrogen gradually and safely. This practice minimizes the risk of nitrogen bubbles forming and helps to ensure the diver's safety during the ascent process.

The other options do not accurately represent the purpose of decompression stops. For instance, while rest during a dive can be important, it is not the purpose of decompression stops. Similarly, changing diving equipment or increasing dive depth does not relate to the function of decompression stops, which focus solely on the safe release of nitrogen from the body.