One Belt, One Road is like a big plan for China to build better roads, railways, ports, and other infrastructure in lots of countries all around the world.
It's called "One Belt" because it involves building a big trade route that connects lots of countries in Asia, Europe, and Africa. And it's called "One Road" because it also involves building lots of other roads and railways that connect to this big trade route.
The idea behind One Belt, One Road is to make it easier for different countries to trade with each other, share ideas, and work together. It will help goods (like products we buy from other countries) to be transported more easily and quickly from one place to another.
China is putting a lot of money into this plan to help build these roads, railways, and ports. They hope that it will create lots of jobs and opportunities for people in many different countries.