What city uses Clipper card?

Could you tell me which city utilizes the Clipper card for its public transportation system? I'm curious about the cities that have adopted this technology for their commuters. Is it a popular method of payment for those who rely on public transportation in those cities? Also, are there any specific benefits that commuters experience when using the Clipper card compared to traditional payment methods? I'm interested in understanding how this system has impacted the daily lives of its users.