What is Risk Management?

Each questions 350 words and provide references
Question 1
What is Risk Management? And provide at least one example of project, product, and business risks.
Note: You do not need to write complex statements taken from web resources. This is a discussion and you will earn better grade if you compose the discussion in your own words and correct grammar based on reading chapter 22 and reputable articles.
Question 2
Description
Explain why the process of project planning is iterative and why a plan must be continually reviewed during a software project.
Note: Please list your reference/s.