A canonical tag helps search engines understand the preferred version of a webpage. When multiple URLs contain identical or very similar content, the canonical URL tells search engine crawlers which page to prioritize for indexing and ranking. This prevents issues with duplicate content, ensuring a single, authoritative source is recognized.
A blockchain is a decentralized, distributed ledger that records transactions across many computers. Each block in the chain contains a timestamp and data, including transaction details. These blocks are cryptographically linked, making the data highly secure and resistant to alteration. This distributed ledger technology (DLT) ensures transparency and immutability, as once a transaction is recorded, it cannot be changed. This innovative system forms the backbone of cryptocurrencies like Bitcoin and is increasingly used for various applications beyond digital currency due to its security and verifiable nature.