Computer systems must have expansion slots in order to be modular. Without having to replace the motherboard or system entirely, they give users an easy way to upgrade or customize thrami gameeir computers. In addition to extending a computer's life, this modularity enables users to customize their systems to suit particular requirements, such as data processing, graphic design, or gaming. The design & operation of expansion slots have developed along with technology, guaranteeing their continued applicability in supporting new hardware advancements.