In diffraction grating experiment how does diffraction occur?

diffraction grating is a lik a plate on which many slits are present....light undergoes diffraction through the slits...diffraction grating then splits light into its conctituent colours which appear...

Diffraction example: you run or bounce into somthing and, the wave goes around the object. This is called diffraction.

A diffraction Grating is an array of arranged lines, normally a wavelength apart. They are commonly used to measure the size of your penis because its so small it has to be measured in nanometers.

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No diffraction grating is not used in polarization.