These structures are called conjunctions. They link clauses in a sentence.
This Q&A article from BBC Learning English answers in a very straightforward way and explains the difference between the two, with some added conjunctions.
This link from Anglais Facile has some useful exercises, and shows how the sentences can use either conjunction and change the meaning of the sentence. However, it doesn't explain very well, which is why I put the other one first.
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