A PC case is the enclosure that houses the components of a personal computer, such as the motherboard, power supply, and hard drives. It protects these parts from dust, damage, and electromagnetic interference while providing a structure for airflow and cooling. Cases come in various sizes, including ATX, microATX, and mini-ITX, to accommodate different hardware configurations. In addition to protection, PC cases often feature design elements like tempered glass panels and RGB lighting, allowing users to customize the appearance of their setup. They also include ports for connectivity, such as USB and audio jacks, enhancing user accessibility.