A visa is one of the conditions for you to be able to go abroad. With a visa, you can go abroad. In addition to passports, visas are really needed to be able to go abroad. In fact, to be able to stay in the UK, you can take a test at http: //britishlifeskills.com to get a visa.
However, to get a visa, you must also have a reference letter from the company you work for. A sponsor/reference letter from the company you work for states that you are an employee of the company, you have requested permission from the company for a vacation within a specified period, and you will return to the company on your return from vacation. This letter also needs to include your name, position, salary (if requested by the embassy), your traveling period, and information that your trip is financed by yourself.
The way to get a sponsor/reference letter from the company is to come to your HR in your office and they will provide it for you.