What's the main difference between "advanced" and "developed?"

Native speaker’s answer
Rebecca
They are similar, but you'd use "advanced" to indicate that something is "state-of-the-art," new, progressive, and maybe even "futuristic." If something is "developed," it could mean that it's improved from the previous time or that it's advanced to a specific degree or point. Ex: The country has a developed transportation system. Ex: The trains are really advanced. They're the fastest and safest in the world.