What is the difference between biclustering and clustering?

Clustering find groups of observations in a p dimensional space (p features).

Biclustering enables you to find clusters in a subset of features. Then why would you need other features than this subset to perform the clustering? Because locally you may find dimensions a & b useful to identify a cluster (green cluster in the figure) and somewhere else in the space, dimensions b & c might be useful to identify other clusters (light blue and purple clusters on the figure).

Sources :

• https://towardsdatascience.com/subspace-clustering-7b884e8fff73
• https://en.wikipedia.org/wiki/Biclustering