the interpreter is in an booth with a headset. He/she is listening to the speaker in one language and is simultaneously interpreting the speech to the other language. This requires the renting of specialized electronic devices

the speaker in one language renders his/her speech, pauses, and then the interpreter translate to the other language

very similar to the consecutive type regarding the way in which it is done. The difference lies, among other things, in the number of people involved in the process, while in consecutive interpreting there is usually one speaker addressing a large audience, liaison interpreting is the one generally used in business meetings between business partners