Hi Rakhi! UK visa application doesn’t ask specifically for a leave approval letter. But I have seen quite a few cases approved/denied based on that particular document. I’m assuming that leave approval letter works as a reaffirmation of strong ties to one’s home country. If you want to have higher chances of approval, I suggest including a leave approval letter from your employer.

The F-1 Visa (Academic Student) allows you to enter the United States as a full-time student at an accredited college, university, seminary, conservatory, academic high school, elementary school, or other academic institution or in a language training program. You must be enrolled in a program or course of study that culminates in a degree, diploma, or certificate and your school must be authorized by the U.S. government to accept international students.


If you want to travel to Australia, whether on vacation or to visit friends or family, you need a tourist visa. The Australian Department of Home Affairs calls these "visitor" visas. To be eligible for any visitor visa, you must be a genuine visitor (not intending to stay there indefinitely) and have enough money to support yourself throughout your entire stay and to return home. There are a few common types of visitor visas (called "streams") that have additional eligibility requirements. You can get a visitor visa online or at an Australian embassy or consulate.[1]
A visa allows a foreign citizen to travel to a U.S. port-of-entry (generally an airport) and request permission to enter the United States. A visa does not guarantee entry into the United States. The Department of Homeland Security (DHS), U.S. Customs and Border Protection (CBP) officials at the port-of-entry have authority to permit or deny admission to the United States. If you are allowed to enter the United States, the CBP official will provide an admission stamp or a paper Form I-94, Arrival/Departure Record. Learn more about admissions and entry requirements, restrictions about bringing food, agricultural products, and other restricted/prohibited goods, and more by reviewing the CBP website.
The DS-160, Online Nonimmigrant Visa Application form, is for temporary travel to the United States, and for K (fiancé(e)) visas. Form DS-160 is submitted electronically to the Department of State website via the Internet. Consular Officers use the information entered on the DS-160 to process the visa application and, combined with a personal interview, determine an applicant’s eligibility for a nonimmigrant visa.
If you will be traveling to India to sightsee, visit friends or family, have a casual business meeting or undergo a medical treatment, apply for an e-Visa online on India's official e-Visa website. There are three types of e-Visa: e-Tourist visa, e-Business visa and e-Medical visa. Select the correct type for your trip – probably the e-Tourist visa – when applying. 

Another website (https://travel.state.gov/content/travel/en/us-visas/visa-information-resources/wait-times.html) can also tell you the expected wait time for a visa in your country. International student visa applicants should receive priority by the embassy or consulate. So, if your academic program begins soon, be sure to explain this when applying for your visa.

There is now a US$350 SEVIS fee for F and M visa applicants, $220 for most J Visa applicants, which supports the cost of the computer system used to record your stay in the United States (SEVIS).. You can pay this fee with an internationally valid credit card. Go to https://fmjfee.com/index.html to pay, and make sure you print a copy of your receipt. You must pay the SEVIS fee at least three days before the date of your visa interview. Bring a copy of your receipt to your visa interview.
Generally, you will need a letter from your employer that provides information about your job and annual income. The Spanish government wants to make sure that you will be able to support yourself during your stay and that you aren't planning on staying in Spain in violation of their immigration laws, but that you have a job to return to. If you are self-employed, submit a copy of your most recent tax return.
I am from India and for the past 5 years, I am working/living in the San Francisco area. I am planning to visit Spain in Sep’19 for tourism. The trip will be for 12 days. I have the Schengen Visa appt coming up in 10 days at the Spanish embassy in San Francisco. I landed on your blog while searching for tips to get required documents for visa appt such as Flight reservations, Hotel bookings, etc. I looked at many of the responses you provided and they looked very precise and very helpful. I want to thank you for the service you are providing to travelers from all over the world especially the ones with “powerless” Indian passport. Kudos to you.
Complete and submit the DS-160 form on line completely. Again, remember to use the exact same order and spelling of your names as they are found in your passport. There is now an additional question that requires you list any social media accounts you have such as Facebook. Then you will print them out and bring them to the Embassy when you go for your your visa interview.
ALERT: On May 3, 2019, the U.S. District Court for the Middle District of North Carolina issued an injunction (PDF) regarding PM-602-1060 and PM-602-1060.1, policy memoranda titled, “Accrual of Unlawful Presence and F, J, and M Nonimmigrants,” issued on May 10, 2018, and Aug. 9, 2018, respectively. Due to the nationwide preliminary injunction, USCIS is preliminarily enjoined from applying the policies in these policy memoranda to F, J, and M nonimmigrants. Until further notice, USCIS will apply the prior policy guidance in AFM Chapter 40.9.2, issued on May 6, 2009: Consolidation of Guidance Concerning Unlawful Presence for Purposes of Sections 212(a)(9)(b)(i) and 212(a)(9)(c)(i)(I) of the Act (PDF, 2.90 MB).
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