What are the naics code?

Hey all, I’m from Ontario, Canada. I’m new to this discussion platform. Does anyone here have any knowledge of naics code? I need some information regarding it. What is its importance? Which type of business is included in it? I’m preparing a seminar on this topic, and it would be a great help if you guys could help me with it. While researching it online, I came across this information on naics code. If you guys have any other information to share, please do so. Thank you.