Coordinating Conjunctions may join single words, or they may join groups of words, but they must always join similar elements such as subject+subject, verb phrase+verb phrase, or sentence+sentence. When a coordinating conjunction is used to join elements, the element becomes a compound element.
Examples: and, but, or, yet, for, nor, so

Correlative Conjunctions also connect sentence elements of the same kind, however, unlike coordinating conjunctions, correlative conjunctions are always used in pairs.
Examples:
both - and
not only - but also
not - but
either - or
neither - nor
whether - or
as - as

Subordinating Conjunctions: These are the largest class of conjunctions. They connect subordinate clauses to a main clause. They are adverbs used as conjunctions.
Examples:
Time: after, before, since, when, while, until
Reason: because, since, so that, why
Place: where, wherever
Condition: if, unless, until, in case
Manner: as if, as though, how