CROWDS is the system that turns the mentality of humans into physical form which can carry out various tasks. Creation of CROWDS is a power that Berg Katze gave to Rui Ninomiya after extracting his NOTE. Rui subsequently makes it into a mobile app on GALAX which he gives away to a number of people, starting with The Hundred. Berg Katze also gave similar or identical power to Rizumu Suzuki who eventually gave it to VAPE members.
The CROWDS App, once activated, creates a digital avatar of the users soul that manifests in the real world. If the avatar is destroyed, the user will experience pain and collapse into a comatose state.
In episode 9, Berg Katse hijacked the GALAX network in Rui's form and gave it away to random strangers who formed the Neo Hundred, a group bent on destroying Japan's government and killing its politicians to bring about a new era.
During second season of the show, following a series of attacks by VAPE, the use of CROWDS application was banned following a poll.