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LangSmith is a tool that helps developers build reliable and high-quality AI applications using Large Language Models (LLMs). It allows teams to track, debug, test, and monitor how their AI system works. LLM applications can sometimes give unpredictable results, so LangSmith helps by providing clear visibility into inputs, outputs, and system behavior. This makes it easier to find errors and improve performance. In simple words: LangSmith helps developers understand and improve AI applications so they work correctly and consistently.