The conjunction is the part of speech used as a "joiner" for words, phrases, ore clauses in a particular sentence. It links these words or groups of words together, in such a way that certain relationships among these different parts of sentences will be established, and the thoughts that all of these convey will be connected.
-Pizza and burger are my favorite snacks.
-The treasure was hidden in the cave or in the underground lagoon.
-Neither James nor Hannah won the game.