Looking through top, I saw a process called "store" taking up one of my CPUs. What is this process? Perhaps it is referring to the app store? If so, I wonder why it is working in the background.
Googling was unhelpful because "store" is too commonly used with other meanings. man, info, and help all did not have an entry for "store."
In my case (Linux PC) process "store" was running by steam client.