The Oxford English Dictionary (OED) is a comprehensive dictionary of the English language, known for its extensive coverage of words, their meanings, and historical usage. First published in the late 19th century, it has become a key reference for scholars, writers, and anyone interested in the evolution of English vocabulary. The OED is unique because it not only provides definitions but also traces the history of each word, showing how its meaning and usage have changed over time. It is regularly updated to include new words and reflect contemporary language trends, making it an essential resource for understanding English.