how to create cron job

Magento 2 Create Cron Job is setting an automatic schedule on time, that is really convenient when you run Magento 2 store. Why is it such useful function? For example, you need assitance from a software like website statistics or content management system which require to run at the certain time, however, maybe you are unavailable to do that. That is why you must create the Cron Job on your web server.