Describe the system of the world economy?

The world economy, in simple terms, is a complex of interactions in economic terms between different peoples and countries that have developed historically. To put it simply, how everything works, some countries extract and produce one product, and others another, this is the interaction, that each region can specialize in something unique, but they sell to all other regions of the world, and with the other side buys what they need, but what other countries produce.