What is a unity candle?

Okay I know it's a candle but like how does it fit into a ceremony. (like what takes place) I understand it's to symbolize 2 becoming 1. But I have never seen anyone do this. never heard of it until I came on here actually. I've seen this type of thing at baptisms but not a wedding.
Update: devilishangel those are GORGEOUS!! perfect for your theme.
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