# Introduction to Virtual Reality
**Virtual Reality (VR)**
Virtual Reality (VR) is a computer-generated, immersive experience that uses headsets to simulate a 3D, interactive world. It tricks the senses using high-resolution displays and motion tracking, creating a strong sense of presence. Key applications include gaming, medical training, education, and remote collaboration, with the market growing rapidly.

**Augmented Reality (AR)**
Augmented Reality is the enhancement of real-world experiences with computer generated information. AR can can trigger the senses of touch, smell or even taste, but it auguments only what we see and hear. AR is different than VR as it enhances our real-world experience while VR teleports us to a virtual world.

**Differences between VR and AR**

| Features | Virtual Reality (VR) | Augmented Reality (AR) |
| -------- | -------- | -------- |
| Definition | It creates a completely new and artificial virtual environment. | It superimposes digital and visual information on the real world. |
|Devices used | Always require devices such as VR glasses, VR headsets, motion tracking devices. |Mainly mobile devices, screen, cameras, which makes it more accessible.|
|Interaction|Interaction only with virtual objects in a virtual world.|Interaction with the real world and virtual objects.|
|Cost|It is a technology that requires a much higher investment.|Less expensive technology.|
|Limitations|It requires a large and well-illuminated space to avoid collisions with physical objects.|It requires a well-illuminated environment to work correctly.|
|Applications|Video games, training simulation, entertainment experiences, design and prototyping etc.,|Advertising, marketing, gaming, education, navigation, medicine, construction etc.,|

**Trends in space and technology**
- AI-Powered Immersive Experiences: Artificial intelligence is being integrated into AR/VR to make environments more realistic and interactive.
- WebAR and Accessibility: WebAR allows users to experience augmented reality directly through web browsers without dedicated apps, increasing user engagement.
- 5G Integration: The rollout of 5G is crucial, offering the high bandwidth needed for cloud-based, real-time, and high-resolution VR/AR experiences.
- Wearable AR/VR Devices: Smarter, more practical, and comfortable headsets/glasses are becoming mainstream, shifting from novelty to enterprise tools.
- AR Avatars and Virtual Beings: The rise of AR avatars aids in social interaction,, while virtual influencers are gaining popularity.

**Indian Companies in VR/AR field**

1. AjnaLens: Known for smart AR hardware and software, focusing on defence, training and education.
2. Fusion VR: Specialized in industrial VR training and digital twins.
3. Queppelin: Focuses on AR filters, VR apps and metaversesolutions for various industries.
4. Trezi: A leading platform for immersive architectural design and real estate walkthroughs.