Negative Reinforcement
Negative reinforcement strengthens a behavior by removing an unpleasant stimulus, like reducing anxiety by escaping a threat. Unlike punishment, it increases action frequency by escaping aversive conditions.

Negative reinforcement is a behavioral concept where an action is strengthened because it removes or avoids an unpleasant stimulus. Unlike punishment, which adds a negative consequence to reduce behavior, this process increases the likelihood of a behavior by escaping aversive conditions like anxiety or threat. It is central to learning theories explaining how organisms adapt to stressful environments.
What this means in real life
A parent stops reminding a teenager about homework the moment they start doing it independently. The removal of nagging reinforces the independent behavior.
What it isn’t
It is not punishment. Punishment adds something unpleasant to discourage behavior; reinforcement (negative or positive) always strengthens behavior by either removing or adding something.
Commonly misused online
People often use it as a synonym for punishment or harsh discipline. Social media conflates 'negative' with 'bad,' missing that negative reinforcement actually increases desired behavior.