Q 2 ; what are processed foods ? what are the danger od consuming too much of processed foods?

I found on the internet that told me that processed foods have been altered from their natural state for safety reasons and for convenience. The methods used for processing foods include canning, freezing, refrigeration, dehydration and aseptic processing.And we have a common idea that processed food is bad for our health ,but I know from there not all the processed foods are unhealthy? For example, milk would be considered a processed food because it is pasteurized to kill bacteria and homogenized to keep fats from separating. While some people prefer to drink raw milk, most of us should consume the "processed" version we find in our grocery stores.
Of course, there are a lot of processed foods that aren't good for you. Many processed foods are made with trans fats, saturated fats, and large amounts of sodium and sugar. These types of foods should be avoided, or at least eaten sparingly.