Trade and development is like a game. Everyone can join, and by playing they can get special bonuses that make their lives better. Everyone starts with different amounts of money and goods. One group of people (countries or companies) trades goods with another group of people. If a group of people has goods that the other group wants and don't have, they will trade for those goods. That is how trade works.
Trade makes it possible for people to get goods and services that they need and don't have, that come from other countries. By trading goods and services with other countries, people can get the goods and services they need without having to make them from scratch.
Development is when a group of people (countries or companies) use the money and goods they got from trade to make their lives better. This could mean investing in things like new roads and buildings, or offering services like education and healthcare. It also could mean using what they had to start businesses and create new jobs, so people have money to buy their goods and services. Through development, people can build their country, even if they started with very little money and goods. Together, trade and development can create a better future for everyone.