State Channel

Offline storage of cryptocurrencies which is arguably safer as they also require physical access (eg. hardware wallet, paper wallets)

Consensus is achieved in a blockchain system when all participants agree on the content of the next block that will be added onto the blockchain.

An encouraging rally by asset/cryptocurrency supporters to buy during a price decline

Decentralized Finance (DeFi) refers to the movement of building decentralized financial applications that have no central authority and is censorship free.