My favorite definition of minimalism is the following:
Minimalism is a way to remove excess from your life. This allows your to focus more on the important things that make you happy, feel fulfilled and free!
I mention minimalism on my youtube channel occasionally because it has changed my life! This lifestyle has gotten me out of debt, decreased my anxiety, helped me save thousands of dollars, and most importantly... I now love and appreciate everything in my life. This goes beyond material things, too. What you do for a living, friendships and relationships... minimalism teaches you to hold on to aspects of your life that you LOVE. So if you have a toxic friendship or relationship... it teaches you to let go as well.
Below are fantastic resources that can explain minimalism much better.
The Minimalists (available on Netflix) - watch the trailer