What Is Lumen?

Lumen ( XLM) has been going up everyday and is now $0.82 with a 34% increase in the last 24 hours. The only reason I know about this coin is because they sent everyone free coins on an exchange and I got about $5 worth. That $5 is now worth $172 right now.

That's amazing!

Today I went to look up Lumen on Coin Market Cap but it's not even listed on there.

Does anyone here invest in this coin or received the free coins they gave away?

Oh wait, I just looked it up with using XLM and it came up as Stellar on Coin Market Cap. Confusing. Did they rebrand?