In the context of Text Mining $($Text Analytics$),$ what is the main difference between Classification and Clustering?

For classification the analyst typically provides training data, whereas clustering is typically done without assuming $($or inserting$)$ any prior knowledge.

Clustering takes sentiment into account, whereas classification does not.

Classification takes sentiment into account, whereas clustering does not.

For clustering the analyst typically provides training data, whereas classification is typically done without assuming $($or insertingl any prior knowledge.