The blockchain is basically used to store records or data in so-called connected “blocks”. In its raw form, it might be defined as a way to store and efficiently manage data. Then how is it different from a simple traditional database? Why bother choosing Blockchain over a database if they have no virtual difference?
To a layman, these questions are important because he/she may not realize fully the differences between these two things. But the thing is that even though Blockchain and Databases may look similar, there are certain aspects of Blockchain which makes it more preferable to our Traditional Database Models.
For starters, you cannot delete an entry once it has been validated and included in the chain. This is not the case with databases where you can enter a new record, update or modify it or even delete it in the future. This may not seem like much of an advantage but reality, this makes Blockchain invulnerable to manipulation.
Another thingis that in Blockchain, everyone in the network has a ledger of sorts and maintains it. Records can only be entered into the open ledger as long as they are validated and after each entry, the ledgers of individuals are compared. This may not be the case with databases as the data can be centralized within a select few.
The way the records are validated also differ. In case of Blockchain, a majority vote is enough but in our traditional database models, a record can only be incorporated if and only if they are validated by each and every member. This is achieved by 2-Phase Commit in Databases. Blockchain is better in this regard on account of their flexibility. In a way, this also grants security to Blockchain as in case of an attack, the attacker needs only corrupt a single node in the network. This would cripple the entry of many records in the traditional database model. But not in Blockchain.