What is Hierarchical Clustering?

 Hierarchical Clustering unsupervised learning algorithm in which each element treated as a standalone cluster.

 

Working of hierarchical clustering:

Hierarchical Clustering unsupervised learning algorithm in which each element treated as a standalone cluster and then iteration executes the following steps:

Firstly:  identify the two clusters that are closest together

Secondly: Merge the two most similar clusters together. And this iteration continues until all the similar clusters are merged together.
   

What is K-means cluster?