what is the need of mongo db for a web developer?
I was a web developer for last 5 years. So, for me the importance came whenever I needed to get something out of database. In the past years, only MySQL was used, but with increasing amount of data, NOSQL databases came into play, and here comes MONGODB.
That was the logical reasoning, and here is one quick link which compares the features of SQL and NOSQL databases: https://www.geeksforgeeks.org/difference-between-sql-and-nosql/
And if you are thinking then why MongoDB, because its the best!