This is something I rarely talk about, but datafeeds are a great way to make money with affiliate programs.
A datafeed is essentially a product database that merchants make available for their affiliates to download.
The data is contained in a large text file, with one product per line. Each line will contain things like the product name, its code number, price, description, order link, and image links.
These different bits of information are usually separated by commas or tab stops, (although the pipe (|) symbol is sometimes used), leading to comma-separated value, .csv or tab-separated value, .tsv files.
Whilst the datafeed might look like an unreadable mess in a text editor, if you open the file in spreadsheet software like Excel or Filemaker, you will see the information is actually in neat columns as defined by the commas or tabs.
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