What is the description of an optocoupler?

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An optocoupler transfers a signal between two electrically isolated circuits using light. It contains a light-emitting diode on the input side and a photosensitive detector (such as a phototransistor or photodiode) on the output side, with a transparent insulating barrier between them. When the input current drives the LED, light crosses the barrier and activates the detector, recreating the electrical signal on the output while keeping the two sides electrically isolated. This isolation helps protect the controlled circuit from noise and surges. The other descriptions don’t match this LED–to–photodetector arrangement and isolation mechanism.