I visited the USA in May this year, on an ESTA which I applied for in April. It was approved and I was allowed entry into the country.
I'm re-visiting again this November for two weeks. Am I able to use the same ESTA again or do I need to re-apply for a new one? I know it says it's valid for two years, but is that valid for every use within those two years, or I have to use it within two years, and once I have visited on that visa, it's invalid?