Prompt Template LangChain

Prompt Template LangChain is a foundational class within the LangChain framework that enables dynamic construction of prompts for large language models through reusable templates with variable substitution. Prompt Template consists of a string template that accepts parameters from users to generate prompts for language models. These templates make constructing prompts with dynamic inputs easier by transforming raw user input into structured data ready for LLM consumption. The class supports f-string formatting, input validation, and template composition, allowing developers to create consistent, maintainable prompts that can be reused across different contexts while maintaining proper formatting and variable injection for production AI applications.