Hey Shruti, That is a great question. The simple answer to your question is it depends on the university you want to join. Universities have their own selection criteria and could keep either exam as mandatory admission criteria for students. The details of the TOEFL and IELTS exams are listed below: TOEFL is an entrance exam conducted by Education Testing Service located in the US, and therefore is conducted in American English. IELTS is considered by about 140 countries in the world, with the major ones being Canada, UK, Australia and New Zealand. For more elaborate information you could visit https://www.ischoolconnect.com/blog/choosing-between-ielts-toefl/ where iSchoolConnect helps you browse the schools that offer the career or course you need in the USA.