Columbia MM is a type of graduate program that helps people learn how to be better managers and leaders. It stands for Columbia Master of Management.
Just like when you learn new things at school, people who join Columbia MM program will learn more about how to lead and manage a team, how to create plans for projects, how to communicate with people in a clear and effective way, and many other important skills that will make them better leaders in the future.
People who want to join this program will need to have already graduated from college and have some work experience. It usually lasts for about one year or two, and during this time, students will have lots of classes and also do some projects to practice what they have learned.
After they finish the program, people who have completed Columbia MM can use the skills they learned to help make their own business better, or work for other companies in leadership positions. It's like they have a big toolbox which will help them be the best at their job.