Metadata is information about data. call it data about data if you like and it could be descriptive, structural, statistical or administrative, the aim is to provide further information about a particular data element for example in descriptive meta data which is useful for discovery and identification as it provides futher information such as title, keywords, authur and abstract.
A) Electronic notebooks store images, videos, notes, and voice recordings in one area, while electronic flash cards are study tools with information written on both sides.
Https://www.toptal.com/bitcoin/blockchain-technology-powering-bitcoin i dont have the time to read it right now, but i was able to find you this link that should hopefully help- you out!
