What is Inherited Sharing keyword in Salesforce ?

Use the <samp>with sharing</samp> or <samp>without sharing</samp> keywords on a class to specify whether sharing rules must be enforced. Use the <samp>inherited sharing</samp> keyword on an Apex class to run the class in the sharing mode of the class that called it.
With Sharing
The <samp>with sharing</samp> keyword allows you to specify that the sharing rules for the current user are considered for the class. You have to explicitly set this keyword for the class because Apex code runs in system context. In system context, Apex code has access to all objects and fields— object permissions, field-level security, sharing rules aren’t applied for the current user. This strategy ensures that code doesn’t fail to run because of hidden fields or objects for a user. The only exceptions to this rule are Apex code that is executed with the <samp>executeAnonymous</samp> call and Connect in Apex. <samp>executeAnonymous</samp> always executes using the full permissions of the current user. For more information on <samp>executeAnonymous</samp>, see Anonymous Blocks.
Use the <samp>with sharing</samp> keywords when declaring a class to enforce the sharing rules that apply to the current user.