Everyday,the world technology is growing better and better. Every mankind in this world are racing to be the number one in the technology development, and Virtual reality is the one that people look for now. Virtual Reality or you can called it VR is a technology that can make the user get to interact with the virtual world that simulated by the computer,so the user will feel “living” on that world. The advantages that Virtual Reality have and no other gadgets have is in combination with physical environments or props, it can generate realistic images, sounds and other sensations that simulate a user’s physical presence in a virtual or imaginary environment.It will stimulates our sense of sight and hearing too. To get the maximum experience of using the virtual reality, you have to make sure you got the other support device such as headset,to get the atmoshphere in it,Controller, to be able to touch something in the game just like our hands,thats the primary device you need to have,the secondary device you dont need to have but you can have it if you want,you may buy the walker, and the suit,to get the feeling of being hit or something like that. There are four element in virtual reality(quoted from “Wirtual Reality dan Perkembangannya”,codepolitan.com,15 January 2018).The first element of virtual reality is.virtual world, its a world that was made by the programmer where we will play on.The second elemet of virtual reality is immersion, its a sensation that could make us feel the world inside even though it just a world made by the programmer or we can call it a fictitious world..Immersion is divided by two,first is mental impression that cause our mental to feel the world inside,and physical immersion where we could feel physically living in that world. The the third element of virtual reality is,Sensory Feedback its use to send the infromation from the virtual world to the user,such as sight,hearing,and touch..The foutrth element is interactivity its the response of the user that send into the virtual world so it can interact with the user. How the VR works?VR headsets like Oculus Rift and PlayStation VR are often referred to as HMDs, which simply means they are head mounted displays. Even with no audio or hand tracking, holding up Google Cardboard to place your smartphone’s display in front of your face can be enough to get you half-immersed in a virtual world. The goal here is to create what appears to be a life size, 3D virtual environment without the boundaries we usually associate with TV or computer screens. So whatever way you look, the screen mounted to your face follows you. This is unlike augmented reality, which overlays graphics onto your view of the real world. Video is sent from the console or computer to the headset via a HDMI cable in the case of headsets such as HTC’s Vive and the Rift. For Google’s Daydream headset and the Samsung Gear VR, it’s already on the smartphone slotted into the headset. VR headsets use either two feeds sent to one display or two LCD displays, one per eye. There are also lenses which are placed between your eyes and the pixels, which is why the devices are often called goggles. In some instances, these can be adjusted to match the distance between your eyes, varying from person to person. These lenses focus and reshape the picture for each eye and create a stereoscopic 3D image by angling the two 2D images to mimic how each of our two eyes views the world ever-so-slightly differently. Try closing one eye then the other to see individual objects dance about from side to side and you get the idea behind this. One important way VR headsets can increase immersion is to increase the field of view i.e. how wide the picture is. A 360-degree display would be too expensive and unnecessary. Most high-end headsets make do with 100 or 110 degree field of view, which is wide enough to do the trick. And for the resulting picture to be at all convincing, a minimum frame rate of around 60 frames per second is needed to avoid stuttering or users feeling sick. The current crop of VR headsets go way beyond this – Oculus is capable of 90fps, for instance, while Sony’s PlayStation VR manages 120fps. Head tracking means that when you wear a VR headset, the picture in front of you shifts as you look up, down and side to side or angle your head. A system called 6DoF (six degrees of freedom) plots your head in terms of your X, Y and Z axis to measure head movements forward and backwards, side to side and shoulder to shoulder, otherwise known as pitch, yaw and roll. Finally, headphones can be used to increase the sense of immersion. From the audio. Because the software from developer, they make sound like goes surround them ( who use VR). So, if you hear sound from right of yours face, the headphone will sounding just right pad, not from both of them, with this, VR user can really know from where the sound camefrom. Head-tracking tech needs low latency to be effect Why? Because head tracking is one big advantage the premium headsets have over the likes of Cardboard other mobile VR headsets. But the big VR players are still working out motion tracking. When you look at VR stuff. You wanted to see other world that you never came before For a while, we’ve seen the Leap Motion accessory – which uses an infrared sensor to track hand movements . So not just head that can see other world. We can touch and also feel like we are on the other side of the world Oculus Touch is a set of wireless controllers designed to make you feel like you’re using your own hands in VR. You grab each controller and use buttons, thumbsticks and triggers during VR games. But there is a problem from this. U not really use your hand. Feel touching something not that far, but we can hope scientist will make one of them So, for instance, to shoot a gun you squeeze on the hand trigger. There is also a matrix of sensors on each controller to detect gestures such as pointing and waving. . Other input methods can include anything from hooking an Xbox controller or joystick up to your PC, voice controls, smart gloves and treadmills such as the Virtuix Omni, which allow you to “walk” in that world Since last year,many company doing a virtual reality technology development,for those who didn’t know there are many uses of this technology:like VR uses for video games.The first is, Playing games using VR will be very exciting because we can feel the excitement in the game. The second, VR uses for watching a movie with VR, of course the feeling must be different.we can feel the real atmoshphere of the film.The third, Military training, now, soldier can train with VR too,they can go to war in VR world and doesnt need to go to the real war.The fourth, Watching a concert through youtube.Now you dont need to go further to watch a concert with the band you like on the youtube canal, and with VR we can feel other people excitement in there.The fifth, Rugby Players using VR to practice.A team call Dallas Rugby has implemented VR training on their list,the uses of it to simulate a real match and studying the tactics.the sixth,VR for the treatment post trauma like soldiers who had just returned home after the war. At the very least, what is obvious is VR will changing how to enjoy entertainment such as playing games and watching videos.In the future,could it be with the virtual reality we will be able to enter into a virtual world like the matrix and others, we are hoping that VR will developted better and better so that the next generation will feel the enjoyment of VR.