I mean it’s just strips of plastic
Edit: What I mean is how does the VCR machine/walkman read the strips of plastic to make the video/souund?
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It’s strips of plastic, yes, but with a magnetic coating.
During the recording process, the sound is converted into electricity and supplied to a recording head, which generates a magnetic field that slightly changes the properties of the magnetic coating of the tape.
This process is deterministic: a given pattern of sound will create a given pattern of magnetic particles.
It’s also reversible — the magnetic tape can be passed over a playback head, which will respond to the magnetic properties of the tape and generate electricity, which is then converted back into sound at the speaker.
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In a radio or cassette player the circuit has many different pieces of components that can convert changes in electrical and magnetic fields into sound.
The cassette tape basically has variations in its stripe, such that when run through a reader, the pattern on the stripe becomes changes in the magnetic field, that ultimate become changes in sound wave and that’s sound.
Same principle with CD player and DVD player, and even Hard Disk Drive in computer. There’s a disk that encodes the information in some way, and there’s a reader that can transform the encoded information into changing electrical current, which then drives the electronic that produce sound and images.
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