# Subject Line Variables

Learn how to use variables in email subject lines.

## Available Variables

You can personalize your email subject lines by inserting variables. The following variables are available:

- `FIRST_NAME`: The recipient's first name.
- `LAST_NAME`: The recipient's last name.
- `EMAIL`: The recipient's email address.
- `COMPANY`: The recipient's company name.
- `ORDER_NUMBER`: The recipient's order number.
- `PRODUCT_NAME`: The name of the product related to the email.

## How to Use Variables

To add a variable to your subject line, use the following syntax:

```
${VARIABLE|"DEFAULT"}
```

- `VARIABLE` is the name of the variable you want to use (e.g., `FIRST_NAME`).
- `DEFAULT` is the fallback value that will be used if the variable is not available.

**Example:**

```
Hello ${FIRST_NAME|"there"}, check out our latest offers!
```

If the recipient's first name is available, it will be used. Otherwise, the word "there" will appear in the subject line.

## Formatting Options

You can use variables as-is or combine them with static text. Make sure to provide a default value for the best user experience.

## Conditional Subject Lines

You can create dynamic subject lines by combining variables and default values, ensuring your message is always relevant.

## Best Practices

- Always provide a default value for each variable.
- Keep subject lines concise and relevant.
- Test your subject lines to ensure variables render as expected for all recipients.