A police service is the organization responsible for law enforcement, crime prevention, and public safety within a jurisdiction. Municipal police services are established under provincial legislation and governed by police boards or commissions. Major cities operate their own police services (like Toronto Police Service or Calgary Police Service), while smaller communities may contract with provincial police (OPP, Surete du Quebec) or RCMP. Police services handle everything from traffic enforcement to major crimes investigation to community programs. Policing represents a significant municipal expenditure, often the largest single budget item. Police service mandates, powers, and accountability frameworks are provincially regulated.