In terms of software, downloadable content (often shortened as DLC) is the name used to designate any piece of software that complements, but does not complete another piece of software. In games, downloadable content normally comes in the form of extra levels or characters that players can add to their game. As the name would imply, this content is downloadable from the internet, normally with a a small monetary cost.
Pikmin 3 contains a number of Mission Mode packs obtainable as downloadable content. These packs add some levels to the Collect treasure! and Battle enemies! modes. While these packs must be paid for on the Nintendo eShop, a small number of extra Mission Mode levels come for free when the player updates the game to a certain version. Since downloadable content became available for purchase, the Mission Mode button on the title screen has a bubble on top of it with the eShop icon. All of this DLC was offered as rewards on the My Nintendo website in July 2017 for a little over a month, with the 4 level packs costing 20 gold points and the 8 level pack costing 40 gold points.
Pikmin 3 Deluxe does not have any downloadable content, and the DLC from Pikmin 3 is included with the base game.
Pikmin 3 packs
The following packs of Mission Mode stages are available for download from the Nintendo eShop, with the total cost of $8.97 / €8.97 / £8.37.