When was the first computer program written?

Explanation

In 1834 Ada Byron (Lovelace) heard about Charles Babbage's idea of "The Analytical Engine". She was inspired by the idea and therefore wrote down a plan for how the machine could make calculations. This plan is now considered to be the world's first computer program. In an article in 1843, Byron actually predicted that such a calculator could be used in the future to compose music, to make graphics and for both scientific and practical use. She got right, but died only 36 years old.