What is a SIEM? What does it do? Where does it get it’s information? Why? How is the information used? How long does it take to be set up?

You are a CISSP for a Fortune 500 company. Write a two-page explanation that details the following: What is a SIEM? What does it do? Where does it get it’s information? Why? How is the information used? How long does it take to be set up?

Is it worth integrating a SIEM into your network system?