For those not in the know, Amiibos are special figures that can grant certain bonuses when scanned into various Nintendo games that support them.
In the case of this particular version of Link (there's a few different versions of him on the market), scanning him into the latest Zelda title, Breath of the Wild, will often give you some of the stronger bows in the game as well as bundles of arrows. These aren't absolutely needed to complete the game, but they are a nice, quick freebie when you're trying to save rupees.
As for the figure itself, it's pretty nice, showing Link in a dynamic pose that's been shown many times in promotional material for this game. I especially like how instead of a somewhat-distracting pole to keep him in a midair pose, the design has a puff of dust acting as support, feeling more in-context with the action being portrayed. The colors are nice, too, and will help it to stand out of a sea of mostly green-clad Links in your collection.
Even if you don't own the game that this currently supports, I'd say pick this figure up if you're a fan of the series in general.