NVIDIA Streamer Service, NVIDIA Streamer Network Service and NVIDIA Streamer User Agent are three of the many processes running on Windows machines that are powered by recent NVIDIA video cards.

NVIDIA is notorious for pushing the limits when it comes to adding new services and processes to its drivers, and if you check your process listing on your Windows PC, you may very well see more than 10 different NVIDIA processes running on it.

You can verify that easily by using Ctrl-Shift-Esc to open the Windows Task Manager and scrolling down to processes starting with the letter N.