Canned ravioli is a processed food as it has added sugar, salt and preservatives to keep it from going bad while sealed in the can.
Processed foods are foods that contain added preservatives which help to extend the shelf life and protect it against harmful bacteria.
Canned ravioli is good for 5 years or more even past it's expiration date as long as the can remains sealed and is not leaking, bulging or rusty.
While the canned ravioli will taste best before expiration it's still safe to eat the canned ravioli and many other canned foods well past their expiration date.
Just make sure the can is in good shape and not leaking, bulging or rusty and make sure the canned food smells good.
Processed foods are not the healthiest due to the preservatives, non natural ingredients, sodium and additional sugar and fat content although they are healthy when consumed in moderation.
Other processed foods are microwave dinners, frozen pizza, deli meat, chips, crackers, cake mixes, yogurt, salad dressing.
Foods with ingredients added for flavor and texture which include added sweeteners, spices, oils, food coloring's etc are all processed foods.