The objective of this lecture on lattices is to introduce fundamental Concept, properties. and application of lattices theory. Its aim is to enhance understanding of order relations, lattices Structures, and their significance in algebra, Cryptography and Computational mathematics, providing insights into real - world Problem- Solving and research advancement in this field. Mr. Rajpal Rajbhar conducted an insightful guest lecture attended by 174 BCA 1st-year students, focusing on partial order sets and lattices. He provided valuable guidance, helping students understand fundamental concepts and their practical applications. The interactive session allowed students to apply key insights in real time, reinforcing their learning through hands-on exercises. This engaging approach not only enhanced their grasp of the topic but also equipped them with essential analytical skills. The session successfully contributed to their academic growth, preparing them to apply these concepts effectively in their future careers and build a strong foundation in the subject.