Difference between direct sales and affiliate marketing?

I’m getting confused what is the difference between direct sales and affiliate marketing?
could any one tell me how does it work?

Many thanks

There are MANY threads about Affiliate marketing here. Rather than you getting many copy/paste messages here, I would suggest using the search at the top to find them.

Read through some of those and if you have specific questions, please feel free to open a new thread. But specific questions will work better than such a generic topic.

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