Conference interpreters are most commonly required to interpret simultaneously. In simultaneous interpreting, the interpreter verbally translates the source language into the target language while the source language is being spoken.

This helps to maintain the speed and flow of communication between all parties, though it requires immense concentration, so interpreters usually work in pairs and relieve each other at 15 to 30 minute intervals.

Conference interpreters commonly work in soundproof booths using a microphone and headset, and delegates can listen to the interpreters via headphones.