by Amit Shekhar · 1 July 2026
How does LangChain work?
How LangChain works. We will also see why we need it, what chains, prompts, memory, and output parsers are, how retrieval and agents fit in, and how the full flow works together in the real world.
Read on Outcome School ↗then come back to lock it in
Before you read, guessWhat is the basic input-output process of LangChain?
Ten seconds, a guess, then read — a wrong guess still makes the answer stick.
What this article covers
- What is LangChain?
- Why do we need LangChain?
- The core idea behind LangChain
- LLM and Prompt Template
- What is a Chain?
- Output Parser
- Memory
- Retrieval and RAG
- Tools and Agents
- A complete flow of how LangChain works
The article lives on outcomeschool.com. Read it there, then come back: the tutor in the margin has read it and will answer questions, and the questions below check what stayed.