In database everyone sends information into an intermediary, that has a single version of a truth, which helps to avoid disagreement between different parties while communicating through a centralized database. Blockchain has another way to solve the data coordination problem and make sure disagreements won't occur, as it is decentralized and there are multiple parties that share a single truth and none of those parties may be considered as central - the consensus has to be reached. So the individual transactions are put into blocks, and the chain of those blocks must ensure consensus.