This research paper explores the dynamic development of the English lexical system, tracing its historical transformations and structural complexities. It examines the influences of various languages, such as Latin and French, on the vocabulary's expansion. The analysis also covers the mechanisms of word formation, including affixation, compounding, and borrowing, as well as the evolution of word meanings over time. This study aims to provide a clear understanding of the English lexicon's past, and it's present state, suitable for students starting their linguistic journey.