A Bitcoin transaction is first broadcast to the network. It receives its first confirmation when a miner includes it in a valid block; every valid block built after that adds another confirmation.
Why confirmations matter
Confirmations show how much additional proof of work has accumulated after the block containing a transaction. Replacing an older confirmed transaction would require replacing that block and catching up with the continuing chain, so confidence generally increases with each confirmation.
A confirmation is evidence of inclusion, not a promise from a bank or payment processor. Bitcoin transfers are designed to be difficult to reverse, which makes checking the destination address before sending especially important.
Each new block adds settlement confidence
A confirmation means the transaction is included in a block. Later blocks build on that history, making a competing reorganization increasingly difficult.
How long should someone wait?
There is no universal number for every payment. A recipient can choose a confirmation policy based on the amount, risk, and service involved. Exchanges and merchants often publish their own deposit rules.
A transaction can remain unconfirmed when the network is busy or its fee is less attractive to miners. A block explorer can show whether the transaction is still pending or has been included in a block.
The appropriate wait depends on the risk
A small everyday payment and a high-value irreversible transfer do not require the same settlement policy. Amount, counterparty, and operational risk all matter.
Sources
Educational information, not investment advice.