The main differences between Simultaneous Interpreting and Consecutive Interpreting lie in two aspects, i.e. whether a specialist equipment is required, whether the interpreting is real-time.
Simultaneous interpreters provide high-end interpreting services for international conferences. One person speaks and many listen through headphones at the same time. Simultaneous interpreters sit in a sound-proof booth and interpret in real-time.
For consecutive interpreting, the speaker delivers a few sentences and then pauses whilst consecutive interpreter repeats what has just been said in the target language. The interpreter may interpret for the whole group or, as is becoming increasingly common, sit next to an individual and whisper what has just been said.