Final answer:
The Database Designer is tasked with defining the database's content, structure, functions, and constraints, while also working with end-users to make sure their needs are met.
Step-by-step explanation:
The role responsible for defining the content, structure, constraints, and functions against the database, and communicating with end-users to understand their needs is the Database Designer. The Database Designer plays a crucial part in the database development process. They take into consideration the criteria and constraints of a project, ensuring the database meets all the necessary conditions. They also develop the design architecture by identifying physical and functional blocks of the database, thereby bridging the gap between concept and implementation. Moreover, their work involves refining and enhancing designs based on tests and evaluations to ensure the databases are optimized for performance and meet end-user requirements.