Depending on the control, ledgers can be divided into three key categories: Centralized ledgers These ledgers are owned and run by centralized authorities like banks, social media companies, s, and Aadhar, etc. Because these ledgers are under the direct influence of a central authority, they can change or manipulate the data without revealing it to the general public. I am not saying they would, but they can! Decentralized Ledgers These ledgers are not owned by anyone and, therefore, are a safe haven for any form of data. However, storing the data in a decentralized ledger isn't always the best option, especially in cases where trust isn't a concern. For example, if your organization keeps all your employee data in a centralized server, there isn't a problem. Distributed Ledgers The owners of this ledger are spread across different geography, and it is difficult to manipulate this data.