How to Flush/reset Dns on Mac HD

How to Flush or refresh your DNS on MAC OS 10.9 or Above. Why do you need to Refresh or Flush your DNS? The Domain (e.g google.com) when you type in your browser checks for the corresponding IP to connect to the web server to get data for your. So every time its waste of resources to keep fetching it for you. So the DNS Records are saved in Local Cache for you. So whenever you Flush your DNS, All the old records in your Local Cache will be Null. Now When you type any domain in the browser it will resolve it to the latest ip and save it in your cache.