A Cyanotype is a type of photography which was famously used by Anna Atkins. Atkins is known for creating botanical illustrations of plants. She discovered the cyanotype process after meeting a British inventor. Atkins neighbour was an astronomer, Sir John Herschel and it was he who discovered that when exposed to strong and bright lights like the sun, a paper soaked a with a complex iron salt solution captured a blue “negative” image once the salts had been rinsed away in 1842.
Anyway, they described perfectly the meaning of the word photography is made up of photo = light and graph = drawing. Therefore, photography is drawing with light.