The edu domain is used for

The edu domain is used by educational institutions such as universities and colleges.

The internet infrastructure and service providers were the intent of the .net domain instead.

International organizations were served by the .int domain, not edu.

None of the above is wrong because educational institutions are exactly edu's purpose.

In the United States, .edu is now limited to accredited higher-education bodies.

Many countries add their own school domains like .ac under a country code.