The hard drive stores files and programs and comes in various storage sizes from 100GB to 2TB. RAM temporarily stores data and programs for fast access while the computer is on and more RAM results in faster program execution. CD/DVD drives can read DVDs, CDs, and Blu-ray discs, with technology advancing to support higher speeds and formats. The CPU controls all software and operations as the "brain" of the computer. The CMOS battery powers the motherboard components like memory and clock when the computer is off. The motherboard connects all hardware components and is the "body" of the computer. Processors execute computing programs, with Intel Core i7 being a recent multi-core processor that provides faster performance