The simple, little conjunctions are called coordinating conjunction (and, but, or, yet, for, nor, so.) From Conjunctions.
"Provided" is another conjunction.
Examples: After, before, until.
Here is an example: "Thailand was the first foreign country I ever visited, at the age of 19, and I don't think I will feel culture shock quite so ripe and raw as that, ever again (unless I manage to travel to an alien planet.)"
One of my Japanese students wrote this sentence: "For example, there was the most demand on books until 2000, and the figure was 50% in 1995 and 43% in 2000."
"Until" is a conditional conjunction, whereas "before" is not.
For example: "Do not let your feet start moving before the gun fires, then give it everything you've got..."