There are no language studies that do not include lexical understanding as an essential component. The purpose of this research is to investigate effective methods of teaching vocabulary in English for Academic Purposes (ESL) classrooms. Drawing on the results obtained from the study of three English for Academic Purposes ESL classrooms at RISE Krishna Sai Group of Institutions, Ongole, Prakasam district of Andhra Pradesh, and the author's personal experience as a teacher and learner, the author discusses various effective vocabulary teaching strategies in the English for Academic Purposes classroom. These strategies have the potential to greatly assist English language learners in their journey towards the realisation of their language abilities and to further the progression of the language. The field of engineering is constantly evolving, with new technologies, materials, and techniques emerging regularly. Lexical study equips engineering students with the skills to continuously expand their vocabulary and adapt to the changing landscape, enabling them to stay informed and up-to-date throughout their careers. Lexical study is crucial for engineering students to enhance their vocabulary, improve their comprehension and communication skills, and better navigate the technical and complex nature of the engineering discipline. Encouraging and supporting lexical study should be an integral part of engineering education to ensure the success and adaptability of future engineers. In the academic setting, a strong vocabulary can contribute to higher grades and better performance in exams and assignments. In the professional realm, it can lead to more effective collaboration, more persuasive presentations, and better career advancement opportunities. The present study explores on how students learn vocabulary in the ESL classroom and what are the factors contribute to their interest in learning.