Data modeling is a crucial process in application development that involves planning a structure to represent how information and relationships between information will be stored within a system. It encompasses three progressive types of data models: conceptual, logical, and physical. The conceptual data model focuses on identifying entities and their relationships, the logical data model adds detail without committing to a specific database management system, and the physical data model involves the actual implementation in a database. Each model serves to facilitate communication among stakeholders and guide decision-making regarding data requirements and structure. While data modeling offers significant advantages, such as improved communication and clarity, it also has potential drawbacks, including time consumption and rigidity in physical relational models. The article highlights the flexibility of document databases, like Couchbase, which can adapt to changes more readily than relational models. The series will continue to explore different physical data models to assist in selecting the most suitable model for particular needs.