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docs/snippets/modules/chains/get_started.mdx

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+#### Using `LLMChain`
+
+The `LLMChain` is most basic building block chain. It takes in a prompt template, formats it with the user input and returns the response from an LLM.
+
+To use the `LLMChain`, first create a prompt template.
+
+```python
+from langchain.llms import OpenAI
+from langchain.prompts import PromptTemplate
+
+llm = OpenAI(temperature=0.9)
+prompt = PromptTemplate(
+    input_variables=["product"],
+    template="What is a good name for a company that makes {product}?",
+)
+```
+
+We can now create a very simple chain that will take user input, format the prompt with it, and then send it to the LLM.
+
+
+```python
+from langchain.chains import LLMChain
+chain = LLMChain(llm=llm, prompt=prompt)
+
+# Run the chain only specifying the input variable.
+print(chain.run("colorful socks"))
+```
+
+<CodeOutputBlock lang="python">
+
+```
+    Colorful Toes Co.
+```
+
+</CodeOutputBlock>
+
+If there are multiple variables, you can input them all at once using a dictionary.
+
+
+```python
+prompt = PromptTemplate(
+    input_variables=["company", "product"],
+    template="What is a good name for {company} that makes {product}?",
+)
+chain = LLMChain(llm=llm, prompt=prompt)
+print(chain.run({
+    'company': "ABC Startup",
+    'product': "colorful socks"
+    }))
+```
+
+<CodeOutputBlock lang="python">
+
+```
+    Socktopia Colourful Creations.
+```
+
+</CodeOutputBlock>
+
+You can use a chat model in an `LLMChain` as well:
+
+
+```python
+from langchain.chat_models import ChatOpenAI
+from langchain.prompts.chat import (
+    ChatPromptTemplate,
+    HumanMessagePromptTemplate,
+)
+human_message_prompt = HumanMessagePromptTemplate(
+        prompt=PromptTemplate(
+            template="What is a good name for a company that makes {product}?",
+            input_variables=["product"],
+        )
+    )
+chat_prompt_template = ChatPromptTemplate.from_messages([human_message_prompt])
+chat = ChatOpenAI(temperature=0.9)
+chain = LLMChain(llm=chat, prompt=chat_prompt_template)
+print(chain.run("colorful socks"))
+```
+
+<CodeOutputBlock lang="python">
+
+```
+    Rainbow Socks Co.
+```
+
+</CodeOutputBlock>