Answer the following questions for me:

1. What is the difference between a public charter school and a traditional public school?
2. How many public charter schools are there in the U.S.?
1. Though charter schools receive tax dollars, they're generally subject to fewer regulations and they receive a lower amount of public funds than public schools. They offer education K-12 and usually take the same standardized tests as public schools. They're often started by parents, teachers, businesses, or government organizations and sometimes focus on specific subjects or unique learning methods.
2. There are currently 7,800 public charter schools in the U.S. attended by 3.7 million students.