Rayleigh scattering VS Raman scattering

[Ebi Rogha]

TL;DR

When studying incidental photons, when should I use elastic scattering (Rayleigh scattering) and when inelastic scattering (Raman Scattering)?

What is the application of each of them?

 

[PeroK]

Summary:: When studying incidental photons, when should I use elastic scattering (Rayleigh scattering) and when inelastic scattering (Raman Scattering)?

What is the application of each of them?

What don't you understand here:

https://en.wikipedia.org/wiki/Raman_scattering

and here:

https://en.wikipedia.org/wiki/Rayleigh_scattering

 

[Ebi Rogha]

What don't you understand here:

https://en.wikipedia.org/wiki/Raman_scattering

and here:

https://en.wikipedia.org/wiki/Rayleigh_scattering

I do not understand when we use elastic approach and when use inelastic approach for:
1- an incident light
2-an incident single photon

 

[PeroK]

I do not understand when we use elastic approach and when use inelastic approach for:
1- an incident light
2-an incident single photon

Is this an idle question? Or, is there some specific reason for asking?