English proficiency refers to the ability to read, write, speak, and understand the English language effectively. It is often measured through standardized tests, which assess various skills such as grammar, vocabulary, and comprehension. High levels of proficiency can enhance communication in both personal and professional settings. Many institutions, including universities and employers, require proof of English proficiency for non-native speakers. Common tests include the TOEFL and IELTS, which help determine a person's ability to use English in academic or work environments. Achieving a certain level of proficiency can open up opportunities for education and employment globally.