Blockchain is the technology behind the Bitcoin
Blockchain technology is the technology underlying the passage of Bitcoin without relying to a centralized server and thus avoid the risk of downtime.
Blockchain system present by changing the implementation approach is becoming decentralized.
What is blockchain??
Blockchain it's database. In the context of the Bitcoin, this database of the contents of the transaction record who tell how bitcoin to whom. That makes the difference is the same database of General, blockchain this system, including decentralization, open, read only, read only means so transactions are recorded, the record it can no longer change it. Actually not be changed, but nearly impossible anyone could manipulate the data recorded.
Blockchain will not replace the existence of databases in General, transactional system, but to slowly but surely blockchain will soon replace traditional databases. In principle, any system that involves the existence of asset ownership, transfer of assets and involve many parties will be very potential to be replaced with a system of blockchain. Currently the system is being developed above blockchain technology such as currency, banking system, supply chain, distribution of music, medical record, identity and so on.