SAP

Hello Aditi,
SAP is basically an ERP system or Enterprise Resource Planning application.
In the simplest language, I am going to make you understand what is actually does.Companies usually have a finance department, sales department, HR department, and more depending upon the size and profile. Now, if all of them maintained their data on different databases, inconsistencies between them are bound to grow and multiply over time. In a competitive market, confusion equals revenue leakage.
SAP is an amazing packaged application that comes to the rescue. A packaged application is one which comes pre-loaded with all features required to perform a standard task. Customization and configurations are required to tweak it as per your business.
It is a certification course.
Yes, a commerce graduate can pursue it.
It is mostly beneficial for HR and finance people.
Since the demand for SAP is rising, it will add to your career.
Good luck.