No Stupid Questions

I often see tv shows and video creators quickly put together compilations where, for example, a politician repeats the same word or phrase across many different appearances. How are they able to find and organize these clips so efficiently?

Is there a specific tool, database, or workflow used to index and search video/audio by spoken words or ideas I’m curious what this process is called and where something like this is accessed.

EDIT: Transcripts can be searched, which are accessible through various means, but it is time consuming and most people don't have libraries built up that contain the content for quick access.

I'm thinking more about something like The Daily Show, SNL, or any late night TV show. I can't imagine that they're manually doing all this work independently.