https://www.niaid.nih.gov/news-events/novel-coronavirus-sarscov2-images https://www.niaid.nih.gov/news-events/novel-coronavirus-sars... says images from a scann

https://www.niaid.nih.gov/news-events/novel-coronavirus-sarscov2-images https://www.niaid.nih.gov/news-events/novel-coronavirus-sars... says images from a scanning electron microscope. What is the difference between that and an "actual picture"?