Agglomerative hierarchical clustering method allows clusters to be read from bottom to top so that the program always reads from the sub-component first then moves to the parent; whereas, divisive hierarchical clustering uses top to bottom approach in which the parent is visited first then the child.
Agglomerative hierarchical method consists of objects in which each object creates its own clusters, and these clusters are grouped together to create a large cluster. It is a process of continuous merging until all the single clusters are merged together into a complete big cluster that will consist of all the objects of child clusters. However, in divisive clustering, the parent cluster is divided into smaller clusters, and it keeps on dividing until each cluster has a single object to represent.
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