Answer:
These are foods that require little to no preparation. That is the convenience (or upside) which these foods represent.
However, convenience foods tend to be highly processed, and also tend to contain excessive amounts of salt, sugar and saturated fats.
Examples include prepared frozen meals, fast food restaurant fare, salty snacks, sodas, candies and fatty snacks.
Convenience foods are considered to be strongly contributory to the obesity epidemic in the U.S.