A conjunction joins words, phrases or clauses. Good use of conjunctions makes your writing flow.
Coordinating conjunctions (FANBOYS)
For, And, Nor, But, Or, Yet, So. They join equal parts of a sentence.
I wanted to go out, but it was raining.
- and adds an idea
- but / yet show contrast
- or offers a choice
- so shows a result
Subordinating conjunctions
These start a dependent clause: because, although, when, if, unless, while, since.
Although it was cold, we went swimming.