A tank is generally speaking built so that juice will automatically make it's way to the wicking material(cotton or silica or other) that is in/around the heating element (coil). You fill it and the juice feeds into the holes that are on the sides of the atomizer head, and when you take a draw, you not only pull air and vapor from the coil, you pull more juice into it to ready it for the next draw.
Dripping is when you have an atomizer (without the tank around it usually) and drip e-juice directly onto the coil itself and the wicking material that feeds the coil and stores the e-juice. You get far fewer draws when you do this compared to using a tank system.
The advantages of dripping (generally speaking) are that you build your own coil and add your own wicking material in any manner you like, to customize your vape experience. Building your own coils can do wonderful things, like adding flavor or vapor in varying amounts. It takes some knowledge to do this, and often dripping is paired with high powered mods to further allow for customization. All of these things are advanced compared to using a clearomizer (like the Mini Nautilus) and take some time to properly learn and perfect. They also require specialized gear (RDA - Rebuildable Dripping Atomizer in particular).
There are also tanks that are made for building coils in/for. These are called RTA - Rebuildable Tank Atomizers. These give the benefits of having a tank to hold a lot of e-juice, but also some of the benefits of making your own coils and adding your own wicking material. These are also somewhat advanced devices that require some learned skills.
Building coils for tanks or dripping also requires specific safety knowledge concerning the battery devices (Mods, Mechs, Regulated devices and Unregulated Devices are some terms used for these). You need to understand ohm's law and safe charging/discharging of the batteries used for these devices.
You could, in theory, drip on the Nautilus's coil and wicking material directly. But since the coil IS as it IS, it will still vape the same - you may as well fill the tank up and vape happily.
If you have any questions, please ask!