What was the columbian exchange was all about including whom it was named after what goods were trade and what countries were involved

The Columbian Exchange was named after Christopher Columbus: the discovery of Americas from the point of view of the Old World is attributed to him.

It was an exchange of populations, species, technologies and ideas between the Old and the New World and the goods were of all sorts: diseases, spices, plant species: not all traded, some brought by mistake (such as diseases).

The involved territories were The land of America (not yet divided into countries) and the whole of Europe and some parts of Asia. One of the prouducts participating in it was cacao and now it's spread throughout the whole Old World and it originated in the new world