All universities in the US are using English as a means of communication. Hence, they require student candidates to submit proof of English competency. A language test is used to assess a person's language knowledge and skill and distinguish that person's ability from that of others. Achievement, proficiency, or aptitude are all examples of such skills. Therefore, taking an English test, such as Duolingo English Test, may help you determine your English proficiency. It may also be a beneficial or required method of demonstrating your English proficiency for job, education, or citizenship in certain countries.