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A network card, network adapter or NIC (network interface card) is a piece of computer hardware designed to allow computers to communicate over a computer network. It is both an OSI layer 1 (physical layer) and layer 2 (data link layer) device, as it provides physical access to a networking medium and provides a low-level addressing system through the use of MAC addresses. It allows users to connect to each other either by using cables or wirelessly. Although other network technologies exist, Ethernet has achieved near-ubiquity since the mid- 1990s. Every Ethernet network card has a unique 48-bit serial number called a MAC address, which is stored in ROM carried on the card. Every computer on an Ethernet network must have a card with a unique MAC address. No two cards ever manufactured share the same address. This is accomplished by the Institute of Electrical and Electronics Engineers (IEEE), which is responsible for assigning unique MAC addresses to the vendors of...

The system unit is the core of a computer system. Usually it's a rectangular box placed on or underneath your desk.  Your computer's system unit probably has at least one floppy disk drive, and one CD or DVD drive, into which you can insert floppy disks and CDs.  Inside this box are many electronic components that process information. The most important of these components is the central processing unit (CPU) , or microprocessor, which acts as the "brain" of your computer. Another component is random access memory (RAM) , which temporarily stores information that the CPU uses while the computer is on. The information stored in RAM is erased when the computer is turned off. Almost every other part of your computer connects to the system unit using cables. The cables plug into specific ports (openings), typically on the back of the system unit. Hardware that is not part of the system unit is sometimes called a peripheral device or device .   Random Access M...

Computer hardware is the collection of physical elements that constitutes a computer system. It referes to: Monitor Mouse Keyboard Computer Data Storage Hard drive disk (HDD) system unit Graphic Cards Sound Cards Memory MotherBoard Chips