What does block size mean?
Blockchain transactions, such as those done with bitcoin and Bitcoin Cash, are conducted on the blockchain.
You can think of each block as a vehicle that carries transactions to their destination. A transaction is concluded once a block arrives and parks itself in the chain.
If each transaction is a passenger, then bitcoin’s 1MB block size is more like a car, while BCH’s 8MB block size is more like a bus.
Larger blocks can hold more transactions, which helps process them faster.