Conjunctions are words that join words, phrases, or clauses. There are three main types of conjunctions:

Coordinating Conjunctions: Connect words, phrases, or clauses of equal importance. Examples: and, but, or, nor, for, so, yet.
Subordinating Conjunctions: Connect a dependent clause to an independent clause. Examples: because, although, since, unless, while, after, before, when.
Correlative Conjunctions: Pairs of conjunctions that work together. Examples: either…or, neither…nor, both…and, not only…but also.