The image is a comprehensive guide to Entity-Relationship Diagram (ERD) notations, an essential component of database design and architecture. It details various ERD symbols and their meanings, including entities, relationships, and cardinalities, which are critical for modeling the data structure of a database. This educational material is an invaluable reference for students, educators, and professionals in the field of database management and design, particularly in understanding how to visually represent data relationships in a structured and clear manner.
