Runnables and LCEL

PositiveProblem-solving typically involves a series of steps. When using LLMs, some applications have relatively complex requirements and a sequence of calls for performing an operation. Here’s when runnables come into play.

What is a runnable?

In Langchain, runnables are a powerful abstraction representing any callable unit of work. They're used to encapsulate and manage different kinds of tasks, including LLM calls, database queries, or calls to external APIs. This allows us to chain together diverse operations in a consistent and manageable way, making it easy to construct complex workflows within Langchain applications.