The meta information is being used by the web browser or by the search engines to rank and let the user find the pages easily.
to let your users know about the information they gonna get and it also reduces the chances of bounce rates.
by writing meta description, you are helping your users to understand the content of your site. and it gives a decent look to your site.
Meta information describes and summarize the contents of your webpage for the benefit of the user and search engine.