Final answer:
The purposes of views in a database are to simplify complex SQL queries, restrict access to sensitive data, store select statements, and allow queries' results to be used as tables, hence improving security and data management.
Step-by-step explanation:
The purposes of views in a database include simplifying issuing complex SQL queries, restricting user's access to sensitive data, storing select statements, and allowing query's results to be used as a table.
Views are essentially saved SQL queries that can simplify complex operations by presenting the data in a predefined way.
They are particularly useful in securing data, as they can be set up to show only certain parts of the data to specific users; thus, they help in implementing database security by restricting access to sensitive information.
Moreover, views help in managing and organizing data more efficiently, by providing a way to group and present data that can be easier to understand or more relevant to particular tasks or user needs.