reinforcer

A reinforcer is something that strengthens or encourages a behavior, most often used in psychology and behavioral science.

When a response is followed by a reinforcer, that response becomes more likely to occur again.

Reinforcers can be positive, like treats or praise, or negative, meaning the removal of something unpleasant.

Food is a powerful reinforcer when training animals.

The term extends beyond formal psychology to anything that bolsters or supports: His success was a reinforcer of his belief in hard work.