Hi aspirant
IELTS (International English language Testing System) is an English language test taken by many aspirants in non English speaking countries who wish to study, migrate or work in English speaking nations. This test is conducted at an international level. It tests your proficiency based on 4 skills i.e listening, reading, writing and speaking.
So yes, you'll need to appear for IELTS exam in order to pursue MS from the US.

Now, some countries do not accept the TOEFL scores. It is the english aptitude test for the United States. It is called TOEFL or Test of English as a Foreign Language. It is accepted by American Universities while IELTS is accepted overseas. You can choose from these two as per your needs.
Hope this answers your query.
All the best :)

Hi,

For MS in abroad you need to be a graduate and after your graduation you can give IELTS exam.

But apart from IELTS, there are other exams also like GRE Exam.

It is conducted by ETS and this GRE Test is one of the most popular graduate admission tests for candidates looking to pursue MS Studies or Graduate studies abroad.

and you can also give TOEFL exam but it entirely depends upon you.