Help w a photography contest?

alexa AFI lover

New member
so i wana enter a contest for high school students, however being an amateur i dont quite get the requirements, can someone descipher these for me???:

"Photographs should be a minimum size of 5" x 7"; film transparencies must be in 35mm format (no glass); digital images must be no less than 300 dpi."

Im planning on sending a digital image, what does dpi mean?
 
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