Final answer:
DRH is used to increase desired behaviors, while DRL is applied to decrease unwanted behaviors without eliminating them altogether.
Step-by-step explanation:
DRH stands for Differential Reinforcement of High Behaviors and is used for behaviors you want to increase. On the other hand, DRL, which stands for Differential Reinforcement of Low Rates of Behavior, is used for behaviors you want to decrease. These are behavioral techniques used in the field of applied behavior analysis and they involve the reinforcement of specific patterns of behavior. DRH is applied to increase the frequency of a desirable behavior, whereas DRL aims to reduce the occurrence of an unwanted or problematic behavior without necessarily eliminating it entirely.