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What are 2GB DDR2 & 500GB SATA HDD?

Currently I read an advertisement about new Acer notebooks. There's a part where they stated 2GB DDR2 & 500GB SATA HDD. What does it mean and what are they? By the way, what's NVIDIA GeForce?

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1. DDR2 In electronic engineering, DDR2 SDRAM or double-data-rate two synchronous dynamic random access memory is a random access memory technology used for high speed storage of the working data of a computer or other digital electronic device. It is a part of the SDRAM (synchronous dynamic random access memory) family of technologies, which is one of many DRAM (dynamic random access memory) implementations, and is an evolutionary improvement over its predecessor, DDR SDRAM. Its primary benefit is the ability to operate the external data bus twice as fast as DDR SDRAM. This is achieved by improved bus signaling, and by operating the memory cells at half the clock rate (one quarter of the data transfer rate), rather than at the clock rate as in the original DDR. DDR2 memory at the same clock speed as DDR will provide the same bandwidth but markedly higher latency, providing worse performance. HDD A hard disk drive (HDD), commonly referred to as a hard drive, hard disk, or fixed disk drive,[1] is a non-volatile storage device which stores digitally encoded data on rapidly rotating platters with magnetic surfaces. Strictly speaking, "drive" refers to a device distinct from its medium, such as a tape drive and its tape, or a floppy disk drive and its floppy disk. Early HDDs had removable media; however, an HDD today is typically a sealed unit (except for a filtered vent hole to equalize air pressure) with fixed media.[2] NVIDIA GeForce is a brand of PC graphics chipsets designed by Nvidia. The first GeForce products were designed and marketed for the high-margin computer gamer community, but later the product's releases expanded the product line to cover all tiers of the graphics market, from low-end to high-end. As of 2008, there have been nine iterations of the design. It is the direct rival of AMD's Radeon series for the graphics processing chips market.
2. These are specifications for different parts of a computer. 2GB DDR2 is the computer memory, the kind that programs use while they're running, but it doesn't stay when you turn off the computer. 2GB refers to the fact that it holds 2 gigabytes of information, which is a good number for almost any normal usage. DDR2 is simply a technical specification, which typical people aren't concerned about -- it means double data rate, but that's just comparing to older technology. 500 GB SATA HDD -- HDD stands for hard disk drive, this is the one you save your files, pictures, documents, etc. to -- like your "C:" drive. 500 gigabytes is generally more than most people will ever fill up, unless they download lots of movies and music. For example, a 3 minute MP3 is 3 megabytes, it would take 166,000 3 minute songs to fill up 500 gigabytes! So it's more than enough. SATA is also a hardware/communication standard, which is the latest style, so there's no problem to choose this either. GeForce refers to a style of video card, the part that displays graphics on your screen. NVIDIA is the company that manufactures the chips on the video card. Unless you're a power user, you won't really need to care about the graphics card -- most of them are more than powerful enough to run modern games and applications. Basically it boils down to this, if you don't plan on doing really intensive things with your laptop, like playing new games or ripping movies, or doing video editing, then go with cheaper laptops -- typically they are more than good enough to run what you need. Also, if you can get it with Windows XP rather than Vista, you'll find that it's a much faster experience -- Vista uses a lot of memory and processor time compared to XP.