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lcel benefits (#10898)

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docs/docs_skeleton/docs/expression_language/index.mdx
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# LangChain Expression Language (LCEL)
LangChain Expression Language or LCEL is a declarative way to easily compose chains together.
Any chain constructed this way will automatically have full sync, async, and streaming support.
There are several benefits to writing chains in this manner (as opposed to writing normal code):
**Async, Batch, and Streaming Support**
Any chain constructed this way will automatically have full sync, async, batch, and streaming support.
This makes it easy to prototype a chain in a Jupyter notebook using the sync interface, and then expose it as an async streaming interface.
**Fallbacks**
The non-determinism of LLMs makes it important to be able to handle errors gracefully.
With LCEL you can easily attach fallbacks to any chain.
**Parallelism**
Since LLM applications involve (sometimes long) API calls, it often becomes important to run things in parallel.
With LCEL syntax, any components that can be run in parallel automatically are.
**Seamless LangSmith Tracing Integration**
As your chains get more and more complex, it becomes increasingly important to understand what exactly is happening at every step.
With LCEL, **all** steps are automatically logged to [LangSmith](smith.langchain.com) for maximal observability and debuggability.
#### [Interface](/docs/expression_language/interface)
The base interface shared by all LCEL objects