1. Purpose: UKVI manages the immigration system of the United Kingdom, including visa applications, immigration rules, and compliance with immigration laws.

2. Visa Categories: UKVI oversees various visa categories, such as study visas, work visas, family visas, tourist visas, and more, each with its own specific requirements and criteria.

3. Immigration Rules: UKVI establishes and updates the immigration rules and policies that applicants must meet to be eligible for a visa or to extend their stay in the UK.

4. Application Process: UKVI provides guidelines and procedures for individuals applying for visas, including the submission of required documents, payment of fees, and scheduling of appointments

5. English Language Requirement: For certain visa categories, UKVI mandates applicants to demonstrate their English language proficiency through an approved English language test, such as IELTS or PTE Academic.

6. Sponsorship: UKVI also manages the sponsorship system, where licensed organizations can sponsor individuals for work or study visas, ensuring compliance with the necessary regulations.

7. Compliance and Enforcement: UKVI carries out compliance checks and investigations to ensure that individuals and organizations adhere to immigration rules, preventing illegal immigration and promoting the integrity of the immigration system.