A conjunction is a joining word. Conjunctions are sometimes called connectives. We can join two short sentences with a conjunction. They also join words or phrases. Conjunctions may sometimes consist of more than one word, for example ‘as soon as’.
Example: The twins sat down. They watched television.
The twins sat down and watched television.
Example: I am going to make a lasagna as soon as I get home.
I am going to make a lasagna [ clause 1] as soon as [conjunction] I get home [clause 2].