---
title: "Introduction to Placeholders"
slug: "introduction-to-placeholders"
updated: 2024-08-23T11:21:33Z
published: 2024-08-23T11:21:33Z
canonical: "help.mail-and-deploy.com/introduction-to-placeholders"
---

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

# Introduction to Placeholders

#### General

Placeholders can be used in Expressions to dynamically insert values into the expression at runtime.

          
          

> **Example:** The Save Content To File System Action has an Output Path property which is an Expression that returns the path to save the content to. You can use a Global Variable Value Placeholder in that expression that references a Global Variable that contains the path (or parts of the path) to save the content to.

The following types of placeholders are supported:

| Placeholder Type | Description |
| --- | --- |
| Datasource Field Value | A placeholder that can be used to insert the value of a Datasource field. |
| Datasource Object Title | A placeholder that can be used to insert the title of a Datasource object. |
| Datasource Variable Value | A placeholder that can be used to insert the value of a Datasource variable. |
| Expression Parameter | A placeholder that can be used to insert the value of an Expression parameter. |
| Global Variable Value | A placeholder that can be used to insert the value of a Global Variable. |
| Report Parameter | A placeholder that can be used to insert the value of a Report parameter. This placeholder can only be used in Expressions within a report. |
| Task Parameter | A placeholder that can be used to insert the value of a Task parameter. This placeholder can only be used in Expressions within a taks. |

          NOTE

          

You can use multiple placeholders in a single Expression; however, not all types of placeholders are supported in all expressions (e.g. the Task Parameter Placeholder can only be used in expressions within a Task).