What is the difference between the Behavioral Inhibition System and the Behavioral Approach System?

What will be an ideal response?

The Behavioral Approach System (BAS) motivates us to approach potentially rewarding situations or stimuli whereas the Behavioral Inhibition System (BIS) inhibits action and is associated with avoidance behavior. Thus, persons high in BAS sensitivity show exaggerated positive affect (e.g., happiness) to rewards and persons high in BIS sensitivity show exaggerated negative affect (e.g., anxiety) to aversive stimuli. For example, a daily-event-diary study found that participants with greater BAS sensitivity (as measured by a self-report instrument designed to measure levels of BAS and BIS) record more positive affect throughout their days, yet those with greater BIS sensitivity report more daily negative affect.