What is xml feed? And how to do it right?

Question

XML

Actually the question is in the title.
There is a task from the client to make 4 feeds for 4 products. I'm not strong at all.
Please tell me how is it done? Preferably with examples
Thank you

Answer 1

Banned on google?

An XML feed is a form of Paid Inclusion or Search Engine Submission in which an XML document is used to provide a search engine with information about multiple web pages. An XML feed is particularly useful for multimedia sites or database sites that draw a variety of relevant search queries.