Call me back its a promise

hey its me shivam todays topic of blog is callback and promise so lets start without wasting any time lets move to actual work soooo the story starts from two things async operation sync operation before understanding callback and promise we first need to understand why async programming even exist because if u directly jump into promise and callback then trust me u will memorize it not understand it 😭 Sync Operation so in this the code run line by line yes this is the simplest explanation of s