Explain the With Sharing ,Without Sharing & inherit (User Context vs System Context) in Salesforce

Here, I have explain the With Sharing, Without Sharing in Salesforce and inherit sharing. Also covered all the related interview question and answer to help in interview sessions.
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[@saikrishnaallampally3543]

Thank you

[@wasidmasroor7985]

very nicely explained

[@aslambagwan6032]

Thanks

[@salesforcent1848]

I saw this video, but didn’t take seriously, got that withsharing with out sharing inner and outer class tricky question in an interview

[@madhumohan7993]

Please clarify my doubt on with sharing and without sharing ,
when class A is with sharing and class B is without sharing
so when we call class B from class A , the sharing settings will respects class B right which is without sharing and everytime it does the same ? as when we call any class from other class the sharing settings respects from the class it called but not from where it is being called right ?
Also another doubt is like when we have inherited sharing class , it always respects the parent class , i.e from where it is being called right ?
What if we class A is not defined as with or without sharing and class B is with sharing then If we call class A from class B? and vice versa
Can some one please give me a clarity on this ?

[@shahirreturns]

what if a class A extends antother

[@rajatrastogi9419]

when trigger calls a handler and that handler class is declared without sharing and then class is further calling another class declared with sharing . what impact we will have on data in trigger.

[@chiragkripalani2340]

System Context --》System Context --》User Context . Data will be based on user's sharing rule.

[@sushmamaurya5083]

very informative session. Thanks very much!
Question : public without sharing class Outer { public with sharing class inner {}}, in this case if outer class is default running in system mode then why do we use without sharing keyword?
it can be like :
public class Outer { public with sharing class inner {}}, so outer and inner will run in user mode?
Kindly reply. Thank you

[@sathyamurthymaila4658]

I believe that here the intention is to make things clear so he has mentioned explicitly the keyword.