There are video cards for each type of expansion slot (PCI, AGP, PCI-E, PCI-E 2.1 and even USB). It is normal to use the slot with the latest technology that your motherboard is equipped with for the video card.
VGA
Many times there will be an on-board graphics card in addition to a graphics card seated in an expansion slot. You should be able to tell by looking for VGA/DVI/HDMI inputs in more than one slot or directly on the Motherboard.
Older motherboards often have a VGA port which allow monitors with a VGA cable to connect without the need of a graphics card.
The other slot is a DVI slot that takes DVI male cables.
The main way to tell which expansion card is the video card is to look at the plug. If it has a VGA socket, a display port socket, HDMI, etc., then you will know it is a video card. You may identify some of the chips on the card as being RAM, or you might find a fan on it, but these features are not exclusive to video cards. If that is the place where you plug your monitor, then it is a video card, unless of course you are plugging directly into the motherboard.
yes, if you have the slot for it
Inside the Case there will be a card Plugged into the PCI or AGP slots. If your VGA/DVI cable plugs into a card in the expansion slots then your card is removable. If not then it is on the motherboard and shares system resources
A VGA card is a video graphics card that is used by most computers. Many websites have deals on VGA cards. For instance, eBay, Amazon, and New Egg all have deals on the latest and best VGA cards.
Most computers come with an Integrated Video Chipset, which means yes it's pre-installed. If you buy a new motherboard, it may not come with Integrated graphics, but it will have either a VGA or PCI-E slot to add an external one. Then again, if a motherboard had integrated graphics it also may still have a VGA or PCI-E slot to upgrade.
All the computers pass signals to the monitors through a graphics card. And its your graphics card that controls the signals to the monitor. A graphics card may be integrated or installed in a VGA, PCI or ISA slot of the main board of your computer.
No :l
VGA ports are 15-pin female display ports that are generally blue. These are found on the back of PC's (near USB ports or further away on a video card) and on display devices such as monitors/TVs. A quick image search will show you exactly what to look for.