Forget about physical trading cards or one-of-a-kind paintings locked up in museums. NFTs are taking this world of singular ownership into the digital age.But what exactly are NFTs? Think of it as a certificate of authenticity on anything, from a viral meme to one-of-a-kind pieces of digital art. That's basically what an NFT is: a token built on blockchain technology that can verify you own something unique, and because of that very nature, it can't be replicated.Think of it like this: All Bitcoins are identical, but all NFTs are like a trading card with a holographic Charizard on it-completely unique!So, what type of digital goodies can NFTs represent? The limit is your imagination! Here's a rundown of some of the most common ones:Artwork: Owning a digital masterpiece from your favorite crypto artist? You bet!Music: Want to own that ultra-rare song clip or that musician's unreleased track? NFTs can do that.Virtual worlds: Want a plot of digital land or an outfit considered super rare for your avatar in some online virtual worlds? Enter NFTs.Why the big deal with NFTs? They changed everything in the way we had been looking at ownership and trading of digital assets. For creators, NFTs are giving them a new avenue to sell work directly to fans and, perhaps, make more. To collectors, it's owning up a piece of verified digital history that might appreciate in value over time.But here comes the catch, that is not all. The NFT market is young and wild; the value of these NFTs can be super volatile, and there are question marks about regulations.