Seats refers to the ‘seat accounts’ and the related unique buyer IDs created to identify buyers. When a new buyer participates in an auction through a DSP (demand-side platform), they are registered with a unique buyer ID. To ensure that the bid requests sent from an SSP (supply-side platform) are only addressed to the appropriate (whitelisted) buyers, each buyer ID is mapped to a ‘seat account’ on the SSP. Each seat account can have multiple DSP connections and therefore can include multiple buyer IDs.