Optimism

Optimistic Rollups take advantage of the consensus mechanism (like PoW or PoS) of their parent chain instead of providing their own. In Optimism's case this parent blockchain is Ethereum.

A cryptocurrency (or crypto currency) is a digital asset designed to work as a medium of exchange using cryptography to secure the transactions and to control the creation of additional units of the currency. Cryptocurrencies are a subset of alternative currencies, or specifically of digital currencies.

A blockchain is an append-only digital ledger storing a set of time-ordered transactions grouped in blocks that are linked together using cryptographic hashes.

Crypto (CTO) was a lite version of Bitcoin using a Lyra2RE as a proof-of-work algorithm.

Automated liquidity protocol on Ethereum

Ethereum is an open-source, public, distributed blockchain computing platform featuring smart contract (scripting) functionality, which facilitates online contractual agreements.

Vitalik Buterin is a Russian-Canadian computer scientist, programmer, writer and founder of Ethereum.

Arbitrum (ARB) is an Ethereum scaling solution developed by Offchain Labs.

Lyra is an options trading protocol accessing the scalability of Layer 2 Ethereum to provide a robust, lightning-fast and reliable trading experience.

A blockchain bridge, otherwise known as a cross-chain bridge, connects two blockchains and allows users to send cryptocurrency from one chain to the other. Basically, if you have bitcoin but want to spend it like Ethereum, you can do that through the bridge.

DeFi is short for "decentralized finance," an umbrella term for Ethereum and blockchain applications geared toward disrupting financial intermediaries.

A decentralized application (dApp) is a service that provides direct interaction between providers and end users providers through a blockchain or distributed ledger.

CoinGecko provides a data platform, digital currency prices, and fundamental analysis of the cryptocurrency market.