In the domain name system (DNS), .sch is a second-level domain used by several countries, including Iran ( .ir), Saudi Arabia ( .sa), and the United Kingdom ( .uk), as a subdomain to represent primary and secondary schools. In the United Kingdom, these are linked with area names, such that schools have a domain name of the form www...sch.uk. It is up to the individual countries whether to use this classification system, and whether a given organization qualifies as a school.
The .sch file extension indicates a circuit schematic file that can be opened by:
- EAGLE (proprietary)
- KiCAD (open source)
- Express PCB (free) https://www.expresspcb.com/expresssch