Charter schools are public schools with more relaxed rules and regulations. These relaxed rules tend to deal with things like Teacher Union contracts and state curriculum. The majority of states (and the District of Columbia) have Charter School laws. Minnesota was the first state to have a charter school law and the first charter school in the United States, City Academy, opened in St. Paul, Minnesota in 1992.
Dayton, Ohio has between 22-26% of all children in Charter Schools. This is the highest percentage in the nation. Other hotbeds for Charter Schools are Kansas City (24%), Washington, D.C. (20-24%) and the State of Arizona. Almost 1 in 4 public schools are Charter Schools in Arizona and about 8% of total enrollment.
Charter Schools can also come in the form of Cyber Charters. Cyber charter schools deliver the majority of their instruction over the internet instead of in a school building. And, like charter schools, they are public schools, but free of many of the rules and regulations that public schools must follow.