This is an Entity-Relationship diagram for the Online Banking System. It is used to examine the database's structure. It depicts the connections between entities and their attributes. An ER model facilitates communication. This bank ER diagram illustrates key information about the bank, such as branches, customers, accounts, and loans. It enables us to comprehend the interrelationships of entities. You can view various entities such as a user, account, transaction, payment, and staff. The entities' attributes are also mentioned, and clear relationships have been drawn. Primary keys enable entity and association sets to be expressed uniformly as relation schemas representing the database's contents.