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Expansion Slots

An opening in a computer where a circuit board can be inserted to add new capabilities to the computer. Nearly all personal computers except portables contain expansion slots for adding more memory, graphics capabilities, and support for special devices. The boards inserted into the expansion slots are called expansion boards, expansion cards , cards , add-ins , and add-ons.
Expansion slots for PCs come in two basic sizes: half- and full-size. Half-size slots are also called 8-bit slots because they can transfer 8 bits at a time. Full-size slots are sometimes called 16-bit slots. In addition, modern PCs include PCI slots for expansion boards that connect directly to the PCI bus.

Memory

Memory, which is commonly referred to as RAM (Random Access Memory), is a temporary (Volatile) storage area utilized by the CPU. Before a program can be run, the program is loaded into the memory which allows the CPU direct access to the program. Memory is a necessity for any computer and it is recommend that you have at least 64MB of memory for your IBM or Macintosh.

Processor
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Look up processor in Wiktionary, the free dictionary.
Processor may refer to:
Central processing unit, the part of a computer that interprets instructions
Manuscripts processor, one who arranges and describes manuscripts collections
Microprocessor, a part of a microcomputer
Graphics processing unit, a dedicated graphics rendering device for a personal computer or game console
Physics processing unit, a dedicated microprocessor designed to handle the calculations of physics.
Digital signal processor, a specialized microprocessor designed specifically for digital signal processing
Audio processor, used in studios and radio stations
Preprocessor, a computer program run before another, such as a compiler
Front end processor
Food processor, a machine for preparing foods
Processor (manufacturing

Motherboard
The main circuit board of a microcomputer. The motherboard contains the connectors for attaching additional boards. Typically, the motherboard contains the CPU, BIOS, memory, mass storage interfaces, serial and parallel ports, expansion slots, and all the controllers required to control standard peripheral devices, such as the display screen, keyboard, and disk drive. Collectively, all these chips that reside on the motherboard are known as the motherboard's chipset.
On most PCs, it is possible to add memory chips directly to the motherboard. You may also be able to upgrade to a faster PC by replacing the CPU chip. To add additional core features, you may need to replace the motherboard entirely.