US Virgin Islands is a US territory and US Visa Policy also applies to the US Virgin Islands visa policy. It means you can apply for a US visa for traveling to US Virgin Islands. There is no separate (individual) visa for US Virgin Islands. All the rules valid for the US visa are also applicable for US Virgin Islands.
For detailed information about US visas, you can check US Visa Policy.
Nationals who are eligible for US Visa Waiver Program are not required to apply for a visa to travel to the USA or US Virgin Islands, but they have to obtain Electronic Authorization (ESTA) if they are arriving by air or sea. Visitors can stay for up to 90 days in the USA or US Virgin Islands.
Electronic System for Travel Authorization is not considered as a visa, but it is a prerequisite for entering the USA by air or sea. You can apply for an ESTA from this website. ESTA fee is 4 USD and if your application is approved, then you will be charged an additional 10 USD.
US citizens who are traveling to US Virgin Islands are not required to carry a passport, the government-issued photo ID is enough for them to enter US Virgin Islands.
British Overseas Citizens of the British Virgin Islands can also travel visa-free to US Virgin Islands.
Yes, you can travel to US Virgin Islands with a US visa. US Virgin Islands is a US territory and US Visa Policy also applies to the US Virgin Islands visa policy.
No, Schengen visas are not valid for travel to US Virgin Islands.
No, Canada visas are not valid for travel to US Virgin Islands.
No, US Virgin Islands doesn’t have its own visa policy. US Virgin Islands is a US territory and US Visa Policy also applies to the US Virgin Islands visa policy. It means you can apply for a US visa for traveling to US Virgin Islands. There is no separate (individual) visa for US Virgin Islands.
Your passport must be valid until your departure date from US Virgin Islands, but it is advisable to possess a passport valid for at least the next six months for avoiding any issues.