What is “cooking from scratch”?

34% of Millennials say that they can cook a meal from scratch.

Can I cook from scratch? I tried to answer this for myself but came up with more questions than answers. In today's day and age, what constitutes "from scratch"? Is the question referring to cooking in general vs ordering out / eating frozen dinners? If we truly wants to break down the difference between cooking and cooking from scratch, we're going to have to sort out where a lot of modern day conveniences land...