A lot of transactions that pay someone have one input and two outputs. The input comes from the payer, one output goes to the payee and the other one (likely) goes back to the payer as a change output.

Related Charts

One-Input Transactions

Shows the percentage of transactions with exactly one input.

One-Input and one-Output Transactions

Shows the percentage of transactions with exactly one input and one output.

One-Output Transactions

Shows the percentage of transactions with exactly one output.

BIP-54 Coinbase Locktime set

Shows the percentage of coinbase transactions that have their locktime set according to BIP-54.