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We hope you have a great time with all your favourite books, comics, audio books, blogs, or whatever you like to read.
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Please explain the use of a comma in the above.
Comments  
JigneshbharatiPlease explain the use of a comma in the above.

I am not quite sure what you want, but I can tell you it's clumsy. The list is all favorite things until "whatever you like to read", which the writer springs on you without warning. It properly should be "We hope you have a great time with all your favourite books, comics, audio books, and blogs, or whatever you like to read." But that is not very good, either. Recasting is necessary, maybe " We hope you have a great time with all your favourite books, comics, audio books, blogs—whatever you like to read."

By the way, you don't read an audio book.