Do you know what a university is? It’s like a big school where people go to learn really advanced things, like rocket science and how to be a doctor. Public universities are universities that are owned and run by the government. Land-grant universities are special types of public universities that were started a long time ago to help more people have access to education.
The association of public and land-grant universities is like a big club where all these universities can get together and work on problems together. They share ideas and help each other make their schools better.
For example, if one university invents a new way to teach math that works really well, they can share that idea with all the other universities in the association so everyone can start using it.
The association also helps the universities get money from the government to do research and build new things. This helps the schools stay up-to-date and provide the best education possible to all their students.