Blockchain is a decentralized, digital ledger of transactions recorded and distributed across the entire network of computer systems that cannot be altered. A blockchain technology serves as an electronic database for storing data in digital form. Most famously, blockchains are used in cryptocurrency systems like to keep a secure and decentralized record of transactions.

Blockchain is the technology that allows cryptocurrency to exist (among other things). Bitcoin is the most well-known cryptocurrency, and blockchain technology was invented for this currency specifically. Blockchain facilitates the verification and traceability of multi-step transactions that require verification and traceability. Blockchain networks provide security for almost all cryptocurrencies, including Bitcoin, Ethereum, Bitcoin Cash, and Lite coin.

Polygon is a blockchain scalability platform based in India. It addresses Ethereum's issues, such as high fees, poor user experience, and low transaction count per second. Polygon blockchain is also anticipating the addition of two new roll-ups to its platform in the near future. One will combine many off-chain transactions into a single transaction, while the other will run on top of the Ethereum network to speed up transactions.

Crypto metaverses are virtual worlds that are immersive and have enormous social and financial potential. Their use of blockchain infrastructure allows them to tap into the larger crypto economy, allowing virtual items to be exchanged for real economic value outside of the metaverse.

A ledger is a "book" that users on the blockchain network can write in. Everyone on the cryptocurrency network has access to this ledger.
For an instance, a new transaction is created when you buy an XBOX through a web-based third-party provider. This transaction must be verified by a majority vote of all users on the blockchain nodes. When a majority vote is obtained, the transaction and its owners are permanently recorded on the ledger. When a new transaction is written onto the ledger and distributed to all nodes at the same time, all users will write it on their own copy of the ledger.