Answer & Explanation
A conjunction is a word that joins words, clauses, phrases or sentences.
For example but, and, or, nor, yet for, so, although, since, because, unless, when, where, while, etc.
There are four types of conjunctions:
1. Subordinating Conjunction
2. Correlative Conjunction
3. Phrasal Conjunction
4. Coordinating Conjunction
In the given sentence, "She is not only a great singer but also an exceptional dancer" Not Only But Also is a type of Correlative conjunction.