What is the role of defense in boxing?

What is the role of defense in boxing?

Mia St. John (IFBA Lightweight Boxing World Champion) gives expert video advice on: How is stance important in boxing?; What is the difference between a 'boxer' and a 'brawler'?; What are the major types of punches and combinations in boxing? and more...

I'm very defensive. I love using defense in Boxing because for me it is all about not getting hit and there are lots of fighters who have little defense or all offense and do not mind getting hit in Boxing. Which I used to be that way and now that I am older, I am wiser and I like to save my brain cells & be more defensive in Boxing.