A coordinating conjunction, also called a coordinator, links parts of a sentence with the same status. This could be two independent (main) clauses, two noun phrases, adjectives, adverbials etc of equal importance.
They include: for, and, nor, but, or, yet,
There's a mnemonic for remembering them: FANBOYS.
It was cold. I wore a coat.
Both sentences are valid on their own, but they can be written as, "It was cold, so I wore a coat."
I attended the meeting. + My friend attended the meeting. = My friend and I attended the meeting.
The three most often used coordinating conjunctions are and, or, and but.
The coordinating conjunction and usually expresses addition or combination.
Poetria has a dog and Karen has two cats.
The coordinating conjunction but expresses a contrast.
We were tired but happy.
The coordinating conjunction or expresses choice.
Would you like tea or coffee?
There are two negative coordinating conjunctions: neither and nor.
She spoke neither German nor French. ("nor" must always be part of the "neither ... nor" construction).
!Note - nor, for, and so can only join independent clauses.