[DaHLiA]

First of all, what a cron job is? Why do we need it at all?
And what programming language do we need to know for creating a corn job?

From what I have read from google search is, Cron job helps us by automatically updating our sitemaps and submitting them to Google which means we need not manually create sitemaps everytime when we make a post (in case of blogs) and submit it at the end of everyday.

Am I right in my understanding? Also, are you aware of any other automated methods than this Cron job?