Block Structure
A block is a container holding a header (metadata) and a body (the list of transactions).
In depth
The body is the bulk — hundreds or thousands of transactions. The header is small but critical: it holds the previous block’s hash, the Merkle root of the transactions, a timestamp and the mining fields. Everything a node needs to verify the block’s place in the chain is in that header.
Why it matters
Knowing what is inside a block demystifies block explorers and confirmation counts.