> For the complete documentation index, see [llms.txt](https://www.xrdev.app/mixed-reality-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.xrdev.app/mixed-reality-docs/lessons/lesson1/concepts.md).

# Concepts

In this lesson, you will learn about the **basic concepts** of **Mixed Reality** and explore the **applications of Mixed Reality** in different **industries**. 

Read through the questions below. If you feel comfortable with the answer, feel free to skip to [project](/mixed-reality-docs/lessons/lesson1/project.md) section or next chapters.

* [What is Mixed Reality? ](/mixed-reality-docs/lessons/lesson1/concepts/what-is-mixed-reality.md)
* [What is the difference between Augmented Reality, Virtual Reality and Mixed Reality?](/mixed-reality-docs/lessons/lesson1/concepts/what-is-the-difference-between-augmented-reality-virtual-reality-and-mixed-reality.md)
* [Why is Mixed Reality important?](/mixed-reality-docs/lessons/lesson1/concepts/why-is-mixed-reality-important.md)
* [Will mixed reality replace our phones and PCs?](/mixed-reality-docs/lessons/lesson1/concepts/will-mixed-reality-replace-our-phones-and-personal-computers.md)
* [How do I decide if I need to develop for Virtual Reality or Augmented Reality?](/mixed-reality-docs/lessons/lesson1/concepts/how-do-i-decide-if-i-need-to-develop-for-virtual-reality-or-augmented-reality.md)
* [What are some use cases for Mixed Reality applications?](/mixed-reality-docs/lessons/lesson1/concepts/what-are-some-use-cases-for-mixed-reality-applications.md)
* [What are some examples of Mixed Reality Applications?](/mixed-reality-docs/lessons/lesson1/concepts/what-are-some-examples-of-mixed-reality-applications.md)
* [What is Mixed Reality Toolkit(MRTK)?](/mixed-reality-docs/lessons/lesson1/concepts/what-is-mixed-reality-toolkit-mrtk.md)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://www.xrdev.app/mixed-reality-docs/lessons/lesson1/concepts.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.