The basic steps
Participants submit transactions. The network checks them using its rules and records accepted transactions in a new block. A cryptographic link connects that block to earlier blocks, creating a traceable history. The exact rules differ among blockchain networks.
Blockchain is a technology, not a promise that every project built on it is useful, safe, or profitable. It supports many cryptocurrencies, but NIST also describes uses beyond cryptocurrency.
Why PSM teaches it
PSM includes blockchain fundamentals in its free crypto and Web3 education because understanding the ledger helps beginners make sense of wallets, digital assets, and common claims about the technology. You can explore the concept before making any financial decision.