Ultra Processed Foods.
Non or minimally processed foods include fruit, veg, fish, meat, eggs, nuts, milk, pulses.
Processed ingredients - eg, salt, sugar, oils, butter, vinegar - are items that you would tend to add to other foods, rather than eating them by themselves (although, obviously, there are people who swear by taking a tablespoon of olive oil a day).
Processed foods are generally created by combining groups 1 and 2 and can be made by home cooks - jam, pickles, bread, preserved fruit. It also includes tinned fruit and many cheeses.
Ultra Processed foods typically have five or more ingredients, which may include additives, artificial flavours, emulsifiers, preservatives, artificial colours and sweeteners and have a long shelf life. Industrial food, you might call it.
Obviously, this isn't a comprehensive list. Unfortunately, the UPF list tends to have the 'fun' stuff - sausages, biscuits, crisps, fruit-flavoured yoghurts, a lot of fizzy drinks, ice cream - but there's no reason (unless you have really strict dietary needs), that you can't have the occasional treat from the naughty shelf.
If you can get them, gluten-free sausages made by your local butcher are a much better option and usually taste much nicer.