A conjuction is a word that joins two words, phrases or sentences.
Sentence 1 - Ram is a boy.
Sentence 2 - Sita is a girl.
Joining these two sentences with the help of conjunction (and ):-
Ram is a boy and Sita is a girl.
Here"and" is used to join the two sentences. Therefore, and is the conjunction.
* in short, conjunctions are referred to joining words.