What is the difference between Post (Offline) and Live (Real-time) captioning?

What is the difference between Post (Offline) and Live (Real-time) captioning?

 

The difference is essentially live vs. pre-recorded. Real-time captioning is performed at the same time the broadcast is aired. A captioner is linked directly to the station and words are captioned as they are spoken. Offline captioning is done after the media is recorded, and meticulously edited before it is used to create a new captioned master, which then goes to air.