Block limit refers to the maximum size a block in a blockchain can be. This size is crucial because it determines how many transactions can be processed and stored within a single block.

When a block reaches its limit, no new transactions can be added until the block is confirmed and sealed. After this, a new block is created. The block limit influences how quickly transactions are confirmed; if the limit is low and there’s high demand, transactions may experience delays.

Different blockchains have varying block limits. For example, Bitcoin has a block size limit of 1 megabyte, which can lead to congestion during periods of high activity. Other cryptocurrencies, like Bitcoin Cash, have increased block sizes to accommodate more transactions.

Overall, the block limit plays a significant role in the efficiency, speed, and scalability of a blockchain network. As the number of users and transactions increases, discussions about adjusting block limits often arise to enhance performance and user experience.