Is Blockchain a distributed database

Question

I have noticed that most of the articles cited Blockchain as a distributed database. Does it mean we can store any type of data in blockchain like audio, video or even a pdf?

Answer 1

You definitely can store any data you want in a hypothetical blockchain. The practical limits are, that you don't want to store very large numbers of data such as a video and you probably don't want to store frequently changing data unless it's important somehow to record every single change forever. In other words, the other feature includes that once something is written to a blockchain, it's there forever and can never be erased. If you need to fix a typo, then you can add a new record with a correction. If you need to delete a record, you can't. The best you can do is to enter a new record saying that the record you wish to delete is "no longer valid" or "should be considered as deleted."