Need of Preprocessing of SAR data

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

Orbit file application
Calibration
Multilooking
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:

https://saredu.dlr.de/

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

https://eo-college.org/courses/echoes-in-space/

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