IQC (Incoming Quality Control) involves quality checks on raw materials, parts, or components entering a factory, typically conducted before these materials enter the production line.
PQC (Process Quality Control) focuses on monitoring and optimizing each step in the production process to ensure compliance with quality standards and prevent defective products.
FQC (Final Quality Control) refers to the final quality inspection conducted after product manufacturing is completed. This inspection ensures that all products meet quality standards and are free of defects before shipment.