means A person who broadcasts live video over the internet — typically gaming, chatting, or performing — for an audience watching in real time.

from From 'stream,' the Old English 'strēam,' a flowing body of water, cousin to the German 'Strom.' For centuries a stream was something you crossed, fished, or fell into. The figurative leap to data came with computing, where information 'streams' continuously rather than arriving in lumps; by the early internet era 'streaming' meant playing media as it downloads. The human 'streamer' — the person doing the broadcasting — surfaced once platforms let anyone open a live channel, and the word floated downstream from the technology to the people riding it.