Need of Preprocessing of SAR data

Could anyone please explain the purpose of each of the preprocessing steps?

Orbit file application
Speckle Reduction
Terrain Correction

Thank You.

@ShivamP1993 please refer to the SNAP help where all these steps are explained

You can also study course-materials on SAR remote sensing, for example here:

Also the ESA MOOC on Radar Remote Sensing is open now:

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