What is the difference between a session key and a master key?

What is the difference between a session key and a master key?.

I’m trying to study for my Writing course and I need some help to understand this question.4.1 List ways in which secret keys can be distributed to two communicating parties.
4.2 What is the difference between a session key and a master key?
4.3 What is a key distribution center?
4.4 What entities constitute a full-service Kerberos environment?
4.5 In the context of Kerberos, what is a realm?
4.6 What are the principal differences between version 4 and version 5 of Kerberos?
4.7 What is a nonce?
4.8 What are two different uses of public-key cryptography related to key distribution?
4.9 What are the essential ingredients of a public-key directory?
4.10 What is a public-key certificate?
4.11 What are the requirements for the use of a public-key certificate scheme?
4.12 What is the purpose of the X.509 standard?
4.13 What is a chain of certificates?
4.14 How is an X.509 certificate revoked?
3 pages, APA format and references atleast 2
Requirements: APA | Discussion | 3 pages, Double spaced

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