What is a Conjunction?

A  conjunction  is one of the 9 parts of speech.

A conjunction is a word that connects two parts of a sentence. The very common word and is a conjunction. Look at how it joins these words, phrases and clauses:

• bread and  butter (joins two words)
• up the stairs and  along the corridor (joins two phrases)
• Ram likes tea and  Anthony likes coffee (joins two clauses)

Here are some other common conjunctions:

• and, but, or, nor, for, yet, so
• although, because, since, unless

And here are some more example sentences:

• Jack and  Jill went up the hill.
• The water was warm, but  I didn't go swimming.
• I went swimming although  it was cold.

Conjunction Form
There is no special form for conjunctions. Many are short, simple words (but, for, since); and others are two or three words (so that, in order that, as long as).

sources : Original Link