They may be small words, but conjunctions are highly functional and very important for constructing sentences. As you can see in the first sentence I used the coordinating conjunction “and” to link different parts of the sentence, which is the main job of conjunctions. Basically, conjunctions join words, phrases and clauses together.
Learn more about coordinating conjunctions.
Here's a list of some of the most common subordinating conjunctions:
Learn more about subordinating conjunctions.
Learn more about correlative conjunctions.