Guns, Germs, and Steel is a book written by a scientist named Jared Diamond that tries to explain why some parts of the world have become more successful than others. He explains that some people have access to guns, which are weapons used to fight other people. Germs are tiny bugs that can make people ill and spread diseases. Steel is a type of metal that can be shaped into tools that can help people do different things, like farming and building houses. Diamond argues that these three things - guns, germs, and steel - gave some societies a big advantage over others. For example, societies that had guns were better able to fight off invaders, while those that had access to germs were able to keep diseases from spreading. And those that had steel were able to make better tools, which allowed them to build better houses, farms, and cities.