39 countries participate in the Visa Waiver Program including the UK, Australia, Austria, Germany, France, Italy, Spain, Singapore, Japan, and others. If you wanna check the complete list of VWP nations, you can find out on their official website. According to the new regulations related to passports, a candidate who wishes to apply for an us ESTA application must have an e-passport. The passport must have a machine-readable zone on the biographic page of the passport as well as it must contain a digital chip with biometric information of the candidate. Read more information here https://gitlab.ce.jku.at/snippets/187