As we know in software development industry no matters if we are developing software for website, for desktop, or for mobiles we need something to save information, which is easy available and in managed way as we all know we have one option to save our information in files. But what when we need to reach a specific information from large information set? What if we want to update? what if we want to delete etc? Getting unique data would be difficult this way to save our information in files.
Relational database management system is very powerful tool to save all our data/information in well managed way, RDBMS are very fast to respond they manage our data in table forms like we see our managed data in excel work sheet, DBMS give unique keys and special ids to information so we can access them to add new relational information, to edit existing information, to delete to update anything.
We use SQL (Structured query language) to communicate with database management system. Like to INSERT, UPDATE, ALTER, DELETE, DROP, ADD and many.
There are many famous Database Management systems like for websites MySQL oracle service, SQL Microsoft service, very famous.
We can say RDBMS is memory of our software, or web applications. And if we dont use RDBMS this would be very hard to access required information, to search information and many other tasks.