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Blockchain is a system in which a record of transactions made in bitcoin or another cryptocurrency is maintained across several computers that are linked in a peer-to-peer network.
The database is a structured set of data held in a computer, especially one that is accessible in various ways.
1)Blockchain is decentralized and no one administers it whereas Database is centralized and has administrators.
2) Blockchain has a public database that anyone can access it whereas in Database authorized access is needed.
3) Blockchain has slower process whereas Database includes a faster process.
An input device is an essential part of a hardware component which provides control over signals about any information and also provides data, such as a computer or any information device. Some of the commonly used input devices are, keyboard, mouse, touch screen etc.
On the other hand, an output device is a hardware component which receives the data or the information from the information device or computer and performs the tasks. The common output devices are printers, speakers, web cam etc.
Block chain is a distributed ledger system which is more anonymousand untraceable where as database system is remote but located on single system which may be targeted to vanish all data, which is impossible in case of blockchain.. in short block chain system also stores data but this data are replicated on networks on different systems.