NFTs are blowing up the digital art and collectibles worlds.

Twitter founder Jack Dorsey sold his first tweet for more than $2 million. NFL star Rob Gronkowski would like for you to purchase his most notable Super Bowl moments. A guy named Beeple sold quirky digital illustrations for almost $70 million through one of the world’s largest auction houses. Before non-fungible tokens (NFTs) came along, these statements wouldn’t have made any sense. Now, however, the digital art and collectibles market has started to explode thanks to the blockchain. These NFTs give creators and investors the ability to sell and buy exclusively digital objects that range from weird 3D videos to songs and everything in between. But, before you go trying to start your career slinging NFTs, you have to know how they work. Here are some answers to common questions.

So, what’s an NFT again?

NFTs are collectibles that only exist in the digital world. The general concept goes back to early last decade, in some form or another, with platforms like Counterparty, which operated on the Bitcoin blockchain. But, the concept has really taken off since roughly 2017, when projects like the adorable CryptoKitties went viral.

To understand the concept, think about it like the money you have in the bank. You store it there instead of bringing home the physical dollars and stuffing them under your mattress because there’s a digital record of it and you don’t need the physical assets. Of course, banks have insurance and major government oversight, which NFTs often don’t.

It works similarly for collectibles. Rather than buying a pack of sports cards, bringing them home, and stuffing them into a box to store, you pay for a pack of digital cards. The issuer only allows a certain number of people to buy each specific digital card, and the transactions get marked down on an official register called the blockchain.

This works for pretty much any digital work. Artists can make videos, photographs, songs, and 3D renderings and then sell a number of official versions to people who want to buy them. The purchasers don’t get a physical product, but they do have ownership of the digital object on the blockchain record, which is public and uneditable through unofficial channels. They can later sell that ownership to someone else for whatever currency they prefer.

[Related: How the world’s most expensive trading cards get authenticated]

Just because you buy an NFT doesn’t mean you’re the only one who will get to see it. In fact, someone could easily just go online, find the media included in that NFT you bought, and download it. Whether it’s a weird 3D animated video, a drawing done by a famous street artist, or a video of an impressive sports highlight, anyone else who wants to see will be able to do so. But, according to the blockchain register, you’ll still own it. So, while anyone can see or watch the media in question, only owners will be able to sell their position on it.

This is hard. Can you give me an example?

Consider the NBA’s wildly popular NFT program called Top Shots. The organization picks highlights from top players and offers NFTs of them in limited releases. Customers buy digital “packs” of NFTs that contain randomized highlights that have been offered as tokens. The company only offers a certain number of each token, and even puts some special edition versions of the tokens up for auction or sale. So, you might luck out and get a LeBron James dunk video as one of your NFTs, but someone who is really lucky might get a token that’s considered a holographic version of the same dunk. It works just like trading cards do in the physical world, only all of it lives online.

The same thing goes for digital artists. Say an illustrator creates a drawing and then issues 20 official NFT slots associated with it. Only 20 people can then buy the art, which they can turn around and sell as if they had bought a physical painting. All of the transactions remain visible to everyone via the blockchain.

Why would anyone do this instead of buying physical collectibles or art?

Physical objects come with their own set of challenges and expenses. If you’re an artist, shipping out works takes considerable time and money, while introducing opportunities for works to get lost or destroyed along the way. The same is true for collectibles. By digitizing the process, it takes away that entire part of the process.

Digital assets are also easier to store and harder to lose as long as you don’t lose access to your account information.

Lastly, and maybe most importantly, because they live on the blockchain and there’s no physical object, NFTs aren’t susceptible to counterfeiting the way art and other collectibles typically are. There are, however, scammers out there who are doing everything from passing others’ work off as their own or just straight up stealing from customers.,

Are NFTs actually worth anything?

Right now, cash is flying around the NFT world like confetti in Time Square on New Year’s Eve. A digital artist named Beeple created an NFT of a collage that recently sold for neary $70 million. The NBA Top Shots mentioned above can sell for tens of thousands of dollars each. And even big auction houses like Christie’s have gotten in on the action.