What is Affiliate Marketing?
Affiliate marketing is a type of performance-based marketing technique in which a business rewards one or more of its affiliates for each visitor or customer brought by the affiliate's own marketing efforts.

Now, how it's works is selecting a product from series of products and requesting from the merchant to promote a specific product of interest, when you get approved you would be issued a unique I.D which is your affiliate link and then you are good to go!

Having gotten the affiliate link you can start promoting the merchant offers and when someone buys your products you get commission instantly

Here Are What You Need To Know About Affiliate Marketing.
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