The Global Forum on Migration and Development is a big meeting where grown-ups from different countries get together to talk about how to help other people who move from their home country to another country.
Think of it like your school having a big meeting with other schools to talk about how they can help new students who come from different countries feel welcome and learn.
The people at this meeting talk about how to make it easier for people to move and find jobs in different countries. They also talk about how to make sure everyone is treated fairly and not discriminated against because they come from a different place.
The grown-ups working on this want to make it so that people who move to new countries can have good lives and not be afraid or worried all the time. They want to help make sure that people can move safely and have the same opportunities as everyone else.