> ## Documentation Index
> Fetch the complete documentation index at: https://langtail.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Variables

<img src="https://mintcdn.com/langtail-64/21vrq2LQuE9wZl3n/images/playground/variables/variables.png?fit=max&auto=format&n=21vrq2LQuE9wZl3n&q=85&s=019d1ecb40d17556b7092523e2dec5bc" alt="Screenshot of Variables in Langtail playground" width="1081" height="284" data-path="images/playground/variables/variables.png" />

### Working with Variables

Variables are a powerful feature in Langtail that allow you to dynamically customize your prompts and models. They enable you to create reusable components and inject context-specific information into your language models.

<iframe src="https://app.supademo.com/embed/cm19bkokd0h9tououxyrxzgr2?embed_v=2" loading="lazy" title="Supademo Demo" allow="clipboard-write" frameborder="0" webkitallowfullscreen="true" mozallowfullscreen="true" allowfullscreen height="423px" width="100%" />

<Steps>
  <Step title="Creating a Variable">
    1. Log into Langtail and select your project.
    2. Navigate to 'Prompts' to either open an existing prompt or create a new one.
    3. In the 'Template' section, craft your prompt.
    4. Add new variable by using curls `{{ }}`
    5. Navigate to the Variables panel
    6. Enter the variable value (text, number, or other data types supported by Langtail).
  </Step>

  <Step title="Using Variables in Prompts">
    1. In the prompt editor, use the `{{variable_name}}` syntax to reference your variable.
    2. Langtail will automatically replace the variable placeholder with its corresponding value when processing the prompt.
  </Step>
</Steps>

**Example:**
Let's create a variable called `company_name` with the value "Acme Inc." and use it in a prompt:

```
Prompt: "Welcome to {{company_name}}! How can we assist you today?"
Output: "Welcome to Acme Inc.! How can we assist you today?"

```