AI Glossary
ReAct
Also called Reason + Act
What does “ReAct” mean?
ReAct: Prompting pattern from 2022 research in which a model alternates between writing out its reasoning and taking an action, then observes the result before reasoning again. Many modern agent loops descend from this idea.

What is an example of “ReAct”?
A ReAct-style agent might note it needs a population figure, search for it, read the result and then do the calculation.