<![CDATA[The digital era's massive data necessitates effective clustering, a machine learning technique grouping data by similarity. Clustering large, complex datasets faces challenges like volume, dimensionality, and variability, hindering algorithms like K-Means. A key issue in K-Means is its sensitivity to initial centroid selection, impacting results. This research aims to optimize clustering performance by integrating the Whale Optimization Algorithm (WOA) for improved initial centroid determination in K-Means, and K-Nearest Neighbors (K-NN) for validating the resulting cluster quality through classification accuracy. Evaluation on iris, wine, heart, lung, and liver datasets using the Davies-Bouldin Index (DBI) showed that WOA-KMeans consistently yielded lower DBI values compared to standard K-Means, indicating superior clustering. Notably, DBI for the lung dataset drastically decreased from 2.38016 to 0.65395. Furthermore, K-NN classification using the generated cluster labels achieved high accuracy (98-99% across datasets), confirming well-separated and internally homogeneous clusters. This demonstrates WOA's effectiveness in guiding K-Means towards better solutions and K-NN's utility in validating cluster distinctiveness. This novel WOA-K-NN combination offers a more accurate and robust clustering method. The significant performance improvements observed across diverse datasets highlight its potential for enhanced data exploration and pattern discovery in complex data mining tasks.]]>
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