What is a database role and profile, and how are each used in a database? Provide examples to support your answer.

Question 1 In no more than 200 words
What is a database role and profile, and how are each used in a database? Provide examples to support your answer.

Question 2
How can privileges, roles, and profiles be used to secure a database? Provide examples to support your answer.
Question 3
Explain in detail the different Oracle data dictionary views which allow you to view privilges information, please provide examples of use of these views.

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