A Bitcoin confirmation represents the number of blocks in the blockchain that have been accepted since the block that included the transaction detail. In other words, a Bitcoin transaction is finalized when it is included in a new block on the network. For example, if Person "A" buys Bitcoin and transfers it to Person "B", the transaction will remain "unconfirmed" until the next block is created. Once this block is created, the transaction is considered to have 1 confirmation.