Observers can detect a wider range of phenomena than a block update detector (BUD) circuit in the computer edition can detect, though has different limitations.
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An observer is placed similarly to a piston, and will observe the block that it is placed against.
The observer block texture has two holes which are at opposite ends when the block is placed.
The smaller hole outputs a redstone signal whilst the bigger hole detects the block update.
An observer will detect changes in its target's block ID or data value, or the breaking or placing of a block.
When it detects something, the observer: It also counts as a block update when the observer itself is moved by a piston.
When this happens an observer emits a pulse after being pushed or pulled but not beforehand.