A conjunction is a word that "joins" ideas together. 
     A conjunction joins two parts of a sentence, two nouns or two verbs together.

Coordinating Conjunctions

The short, simple conjunctions are called "coordinating conjunctions":

  • and, but, or, nor, for, yet, so

A coordinating conjunction joins parts of a sentence (for example words or independent clauses) that are grammatically equal or similar. A coordinating conjunction shows that the elements it joins are similar in importance and structure.

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Subordinating Conjunctions
A subordinate clause, which is sometimes called a dependent clause, has a subject and a 
verb but is not a complete thought and cannot stand alone. It usually begins with a subordinating word, like what, that, who,which, because, when,
since, before,
after, or if.  

Correlative Conjunctions
Correlative conjunctions are pairs of conjunctions that work together. The most common ones are both … and, either … or,neither … nor, not only … but also, and whether … or