The word that joins words or two parts of a sentence is called a conjunction. Conjunctions are also called 'joining words' or 'connecting words'. Conjunctions only join words or two parts of a sentence, they do no other work. The words 'and', 'but' are joining words or conjunctions. They are used to join words as well as sentences.
Let's understand through examples, how 'and', 'but' can be used to join words or sentences.
And is a connecting word that tells you more. It is used to join two parts of a sentence that are grammatically equal.
Example: The bird can fly. The bird can hop.
The bird can fly and hop.
Here, 'and' ' is used to join the words fly and hop and tells that the bird can fly as well as hop.
But is a connecting word that makes a contrast between two words or sentences.
Example: He hit the ball. He dropped the bat.
He hit the ball but dropped the bat.
Here, 'but' is used to join the sentences with unlike ideas.
Thus, the conjunctions, 'and', 'but' are used to join words or sentences that are similar in structure. Also, they come between the words or sentences they join.