In PrologA logic programming language — programs are sets of rules queried by an inference engine. you write what is true ('Bob is a parent of Ann') and what rules follow ('a grandparent is a parent of a parent'), then ask questions ('Who are Ann's grandparents?'). The engine finds answers by searching possibilities. It powered expert systemSoftware that encodes specialist knowledge as rules — early commercial AI before modern machine learning.s, language tools, and AI research, and influenced how later languages handle automated reasoningStep-by-step logical thinking in AI models — chain-of-thought before answering hard problems..

PrologA logic programming language — programs are sets of rules queried by an inference engine. was the first widely used language where you describe problems as logic instead of step-by-step instructions.

It showed that rule-based, declarative programs could run real applications — from language research to industrial expert systemSoftware that encodes specialist knowledge as rules — early commercial AI before modern machine learning.s.