https://www.maximizemarketresearch.com/market-report/global-photomask-market/35762/

A photomask is tool used for manufacturing components including electronic devices (semiconductors), PCB, displays and Micro-Electro Mechanical Systems (MEMS). The patterns are transferred onto the baseplates using photomasks. A non-transparent film created by writing or exposing the designer's pattern onto a resistant-coated chrome mask blank is applied to quartz or glass substrates to create photomasks.