A coordinating conjunction connects words, phrases, or clauses that are independent or of equal rank.
The following words are coordinating conjunctions:
so [mnemonic: fanboys]
John ate pizza and hamburgers.
A subordinating conjunction is used at the beginning of a subordinate clause (or dependent clause).
Subordinating conjunctions include words like although, after, before, whether, soon, therefore, etc.
Although she ate the food, she did not like it.
A correlative conjunction is always used in pairs and connects words or statements of equal rank.
The correlative conjunctions include words like both/and, either/or, neither/nor, etc.
Does she like both pizza and hot dogs?