The Schengen Information System (SIS) is an EU database that allows law enforcement, border, and immigration authorities to enter and consult alerts regarding wanted persons and stolen property. It facilitates information sharing between member states and EU agencies. The Commission is proposing to expand SIS by adding new alert categories and improving security and data protection. New categories will include alerts on unknown wanted persons identified by fingerprints and preventive alerts for missing children. Access to SIS will be expanded for Europol and the new European Border and Coast Guard Agency. Strict rules ensure data quality and protect individuals' rights.