Eco-industrial parks are places where businesses that make things and need resources like energy or water work with other businesses to get or recycle their resources in an environmentally friendly way. For example, one business might need lots of water to make its product. Rather than buying or getting water from somewhere else, it can use the water that comes from another business. That can help save money, and it can help the environment because the water won't need to be transported far, so it won't produce a lot of pollution.