+A **shutter** is a mechanism that momentarily opens and closes, regulating the flow of light or air. In photography, it controls the duration light reaches the [Image Sensor](/wiki/image-sensor), defining [Exposure](/wiki/exposure). Other forms protect windows or secure spaces.
+## See also
+- [Aperture](/wiki/aperture)
+- [Camera](/wiki/camera)
+- [Photography](/wiki/photography)
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