conceptual model	the logical structure of the entire database
data independence	the immunity of user applications to changes made in the definition and organization of data
data model	a collection of concepts or notations for describing data, data relationships, data semantics and data constraints
data modelling	the first step in the process of database design
database logical design	defines a database in a data model of a specific database management system
database physical design	defines the internal database storage structure, file organization or indexing techniques
entity relationship diagram (ERD)	a data model describing the database showing tables, attributes and relationships
external model	represents the user’s view of the database
internal model	a representation of the database as seen by the DBMS
logical data independence	the ability to change the logical schema without changing the external schema
logical design	where you create all the tables, constraints, keys, rules, etc.
logical schema	a conceptual design of the database done on paper or a whiteboard, much like architectural drawings for a house
operating system (OS)	manages the physical level of the physical model
physical data independence	the immunity of the internal model to changes in the physical model
physical model	the physical representation of the database

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