> For the complete documentation index, see [llms.txt](https://www.noobcoding.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.noobcoding.com/topics/informationretrieval/classification_and_clustering.md).

# Classification and Clustering

This part we dicuss the some of the classification and clustering techniques, focusing on those related to the models we've dicussed in ad-hoc retrieval. It's useful in a way that the system is able to prepare relevant content even when the user isn't actively inputing queries.