If I told you that there is going to be something opposite to the NFT called SBT… What would you say? 
In May 2022, E. Glen Weyl, Puja Ohlhaver, and Vitalik Buterin published a whitepaper titled Decentralized Society: Finding Web3's Soul. They represent the DeSoc (Decentralized Society) and the Soulbound Token (SBT). 

To explain the mechanics of a Soulbound Token, it is best to compare it to an NFT. If you own an NFT, you can sell it. You can send it to your friend. If you decide you want to buy an NFT, you can just buy it. 
The idea behind SBT is that you can't buy it. You can't send it to anyone. Only someone else can issue an SBT to you - Soul accounts exclusively can issue SBTs to each other. The SBT can also be removed by the Soul account that issued it.

Let's summarize what a Soulbound Token is

It can't be bought. 

It cannot be sent to anyone (non-transferability). 

It can only be issued by one Soul account to another (the idea is that users should have multiple Soul accounts, for example a medical, work, or education account, etc.). 

It is possible to remove a Soulbound Token from the account that issued it. 

As with the NFT, it is a blockchain token.

Let's summarize what a Soulbound Token is


Education degrees

Imagine a world where you have a Soul titles account that would enable anyone to verify if you have actually graduated from a given school. There would be no need to prove your diploma validity. The diploma could not be falsified. It would simply be possible to confirm if a diploma was issued by, for example, Harvard University.

Certificates

After taking a course, you wouldn’t receive a paper certificate, but an SBT would be issued to your Soul account. Driver’s licenses, ID cards, etc. could all actually be SBTs. The state would have its own Soul account from which it would issue SBTs.

Medical records

In the case you change doctors, there would be no more need to forward your medical records from one doctor’s office to another. Instead, all of your medical information would be stored in your Soul health account - not accessible to the public, of course.

Job records

Imagine a digital resume with a confirmation of your job tenure from all the companies you’ve worked for. It would be impossible to introduce changes to the confirmations, so there would be no false information about past employers and experience.

A few more ideas

• Birth certificates
• Olympic medals
• Criminal records
• Albert loyalty points 🙂

Your imagination is really the only limitation to where and how such a token could be used.