Data Flexibility is maximized. The Data are indexed and cross referenced in order to define all required relationships amongst the different data items. Relational databases are based on a logical data model. They are easy to comprehend but an understanding of the underlying data model is essential for them to be employed effectively. Data access is independent of the physical storage mechanism.
Relational databases are adaptable.
In data base modeling an entity is used to describe items about which we collect data. Entities are generally referred to in the singular. They are identified by phrases like noun verb noun i.e. entity relationship entity. A snow profile has one or more layers. Entity definition from data dictionary.