Qu’est-ce que Block ?

Each block carries a header (version, previous block hash, a commitment to its transactions, a timestamp, the difficulty target and a nonce) and the transactions themselves. Miners assemble candidates and search for a header hash below the target.

Block space is deliberately scarce. That scarcity is what creates a fee market: users bid for inclusion, and the bidding is what will eventually replace the block subsidy as miner revenue.