The Catholic University of America

Immigration Basics

A basic understanding of U.S. immigration concepts and terms is critical for:

  • University departments hosting international students, faculty and visiting researchers
  • international students
  • international faculty, researchers and visiting scholars

The U.S. has over 20 different nonimmigrant statuses, each with specific rules, restrictions, durations, and eligibility requirements. Not every classification can legally work or study in the U.S. These pages are intended to provide brief overviews of key immigration-related concepts.

Things to know about Nonimmigrant Classifications

Things to know about maintaining legal nonimmigrant status in the U.S.

Things to know about traveling outside the U.S.

  • Maintain valid passport
  • Travel to Canada and Mexico
  • Travel Signatures (F and J status holders)
  • Applying for a visa to enter another country

Things to know after obtaining permanent residency

Things to know about National Security Concerns

Working with Immigration Attorneys and Attorney listing