NeMo Guardrails is an open-source toolkit developed by NVIDIA that enables developers to incorporate programmable guardrails into applications powered by large language models (LLMs). These guardrails help guide and control conversations, ensuring that AI systems operate within defined parameters and avoid undesired topics or behaviors. The toolkit offers features such as input and output moderation, fact-checking, and content safety measures. By integrating NeMo Guardrails, developers can build trustworthy, safe, and secure LLM-based applications that adhere to specific guidelines and standards.