You can work, only if you have obtained the particular visa that entitles you to work. For example, you cannot work on tourist visa in the US. It permits you to stay in the US only for a temporary period of time. You need to get H-1 B or other employment specific visas in order to work.
To get a work visa you will need a work permit. When you get the work visa it will act as your entry visa to the country. So you will not need a separate visit visa.
How you can get greencard if you work with visa J1?"
Of course not. You cannot work in Singapore with a visitor's visa. This would be illegal. You have to apply for a Singapore work visa.
Yes. To legally work in Kuwait, you must have a valid Kuwait Work Visa, which is usually sponsored by your employer. Without a work visa, employment in Kuwait is not permitted.
A "visa" is kind of like temporary citizenship. A "work visa" allows you to work in a country you aren't a citizen of, and a "visa" allows you to live there.
No, you cannot work in the US with a tourist visa.
No, it is not legal to work in the USA without a visa.
No, you generally need a visa to work in the UK if you are not a citizen or a resident with the right to work.
You can only work in the US if you hold a valid work-authorized visa, such as H-1B, L-1, or O-1. A tourist visa or other non-work visas do not allow employment in the United States.
To work legally in another country, you must apply for a work visa issued by the country where you plan to work. Each country has its own immigration rules and visa categories for foreign workers. For example, if you want to work in Canada, you must apply for a Canadian work permit; if you want to work in Australia, you must apply for an Australian work visa.
If you are a Canadian citizen and your spouse is a TN visa holder, you may be eligible to apply for a TD visa, which allows you to enter and stay in the US as a dependent of your spouse. However, the TD visa does not grant you authorization to work in the US. If you want to work in the US, you would need to separately apply for a work visa that suits your qualifications and employment situation, such as an H-1B visa or an L-1 visa.
A company has to sponsor the Mexican to get a work visa.