35mm, 70mm, IMAX, 4K ...???.. Here is some clarification

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Video data are of two basic types:
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1. Analog
2. Digital

1. Analog:
Analog video filming are broadly categorised in 35mm and 70mm.
-35mm film: Normal analog film
-70mm film: IMAX (Image maximum) film. Its almost 3 times better clarity compared to 35mm.
Project instrument required for 70mm film projection are also different compared to 35mm.

2. Digital:
-240p/ 360p/ 480p: Basic digital video recording
-HD (High definition) 720p (1280 x 720)
-FHD (Full high definition) 1080p (1920 x 1080)
-QHD (Quad high definition) 1440p (2560 x 1440)
-2k (2048 x 1080)
-UltraHD:
- UHD 4k (4096 x 2160)
- FUHD 8k (7680 x 4320)
- QUHD 16k (15360 x 8640)

In normal analog theaters, 35mm film is projected.
In normal digital theaters, 2k/ 4k films are projected. Here, the theater screen is coated with some material to increase the light reflection inorder to improve the viewing experience.
Its mentioned in terms of GAIN. GAIN1, GAIN2 or GAIN3.

Now a days, IMAX(70mm analog) also comes in IMAX-digital. But, when IMAX is mentioned, its usually IMAX 70mm analog.
IMAX image clarity is too good. The crowd sitting in front row can also have the best image clarity without blurring

Viewing experience of IMAX is way awesome compared to any of the three: 35mm, 2k, 4k
But if put to compare, the viewing experience goes improving left to right:
35mm -> 2k -> 4k -> IMAX