Many immersive media experiences are immersive videos, which are defined by being both created and played back in a very-wide field of view that results in an immersive experience, often in a VR headset (typically 180 degrees or more). The most popular immersive video formats are defined by their respective FOVs: 360 video (all the way around) and 180 video (halfway around). Both 360 and 180 videos can be 2D (monoscopic) or 3D (stereoscopic). Because 360 videos are fully spherical, viewers can look around in all directions when viewing in a VR headset. 180 videos are hemispherical, and while they are still convincingly immersive, the back half of the world is black. Immersive videos provide 3 degrees of freedom (3DOF) when viewed in VR.
A good way to think about immersive video formats is that you must choose 1) a FOV, either 360 or 180, and 2) the number of “eyes” to target, either one (monoscopic) or two (stereoscopic).
As a quick starting point, check out this Immersive Video Formats Video in your Meta Quest 2 headset. It gives examples of the formats that are used in immersive video.
Interactive immersive media experiences are typically created as either bespoke VR apps, although WebXR is also a promising (and completely democratized) emerging ecosystem. If you are interested in developing VR apps, head over to the Developer Center.