Salesforce developer Interview Question : What is Global access modifier in salesforce | when to use

[viveksaini]

Please correct me if i'm wrong.

global makes a class usable by code outside of a managed package; public makes a class usable by any class within the managed package or within a non-packaged set of source code..

[crazyhackerarjun]

Batch class ko bhi global keyword k sath create karte h kya companies m e