# Input Node
An **Input Node** allows you and your end-users to input text into a workflow. The text query is passed to any node that accepts a text string as input.
The most popular nodes accepting text inputs are:
1. The LLM nodes (adding the input as part of their prompt).
2. The Knowledge Base nodes (they use the input as a prompt to retrieve information from their contents).
Key characteristics:
* Inputs can be text fields of any length and are passed to their connected node in the flow.
* While inputs can be of any length, you should be mindful that LLM prompts have a limit on how long of an input they can process. If you expect long inputs, make sure you select a model with a sufficiently large context window.
* To expose an Input node to your users, you will need to set it up in the [**Interface**](https://docs.stack-ai.com/stack-ai/export-options/deploy-with-the-export-view) tab.
### Inputs in the Interface tab
The **Interface** tab is where you **export and deploy** your project, and define how end-users will interact with it. When your project is published to the Interface tab, end-users can use the agent interface to provide input (for example, by typing a message) which is then passed into the workflow.
#### Chat Assistant Interface
If you select the **Chat Assistant** interface, the message typed by the end-user becomes the workflow input and is passed into the Input Node in your workflow.
#### Form Interface
If you select a **Form** interface, inputs appear as form fields the user fills out before running the workflow.
* Each Input Node becomes a field in the form.
* You can include multiple Input Nodes, and each one will appear as a separate form field.
* You can choose which inputs are required vs optional.
* Users submit the form, then the workflow runs with those values.
