"Ivan Pavlov" is not a common English word, but rather the name of an important Russian scientist. Here’s an easy explanation of who he was and why he is significant:
Ivan Pavlov (1849-1936) was a Russian physiologist, a type of scientist who studies how living things work. He is best known for his experiments with dogs that showed how living beings can learn to associate one thing with another. This is called "conditioning."
Ivan Pavlov was a key figure in understanding how learning and behavior work through his studies of dogs.