People use the term "blockchain technology" to mean different things, and this can be confusing. Sometimes they talk about Bitcoin Blockchain, sometimes it's the Ethereum Blockchain, sometimes it's other virtual currencies or digital coins, sometimes it's smart contracts. Mostly, they talk about distributed ledgers, a list of transactions.
The node that assembles the facts (transactions) into "blocks", by adding a header that contains the block size, the number of transactions it contains, the date and time, a checksum (" Hash ") which will serve as the unique identifier of the block, and the identifier of the previous block, is called the miner.
To deepen the subject, look at this excellent introduction video on Bitcoin, where also explain what the blockchain.