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Entity in an ER diagram

Hello Everyone, As of now I am in my hometown because of coronavirus and I am learning online database management systems to improve our skills. I have doubts in what is an Entity in an ER diagram? when I learned some extra topics in DBMS, I am confused at some points. Can anyone know about it? Or suggest me some more interest topic which is useful to my interview point of view also.

It's simple the box drawn in an ER diagram, so could be a table or something similar, mainly an object.

Yep. An entity is an object / thing about which you need to maintain information.

Typical entities include Customers, Employees, Orders, etc..