Compact cameras are designed for the consumer market and are very easy to use, with its focus and exposure settings automatically set by the camera. SLR cameras offer the same point and shoot convenience as compacts. But SLR cameras have the option of manual control and the versatility of interchangeable lenses. SLR cameras are designed more for those serious amateur or professional photographers. Both the camera types are capable of producing very clear and bright images.
The third camera type in the marketplace is in the form of Digital Cameras, which don't use film at all. Images are stored digitally in the camera's internal memory, on removable memory cards, or floppy disks. These cameras can be connected directly to personal computers. Thus photographs can be easily transferred from the camera to the computer for storage, manipulation, or uploading to the Internet.
Parts of a Camera:
A camera consists of seven basic components: a viewfinder, a focusing mechanism, a shutter, an adjustable aperture, a lens, a body, and devices for controlling film alignment and advancement.

Accessories are available to elevate the performance and the comfort ability in use of the camera. These are items that are subordinate or supplementary. However they are desirable as they contribute to the overall effect of the main product.
Since digital camera is more widely used its accessories are widely available. They provide comfortable options to download the images. Therefore they are more widely used for tours and other special occasions by the non professionals. In such cases the camera battery is one accessory that is necessary to keep the camera active even in long journeys. The camera chargers are the angels in disguise in such long journeys, etc where you cannot solely rely on the camera battery. Another very important accessory of the cameras is its memory card. In parties and other occasions you may not be able to download the images from time to time. In such cases an extra memory card is the right accessory to help you out. The camera in order to perform well also needs an AV cable, data cable and power cable.
To improve and adjust the lens according to your need, the lens adapter is an important accessory. There other camera lenses apart from the main lens that are used according to the need. They may be telephoto or wide angle lens or any other lenses of varied measures or focal lengths. The camera flash, Digital Photo Frame, MP3 Player, Supports CompactFlash, Memory Stick, Microdrive, MultiMedia, and SD Memory Cards, Remote Control, Built-in Stereo Speakers, infrared lbs are all accessories that support and elevate the overall performance of the camera.
There are LCD screen protectors to keep the LCD screen scratch free. Speed rating cards are another important accessory used to accelerate the rate of both writing and reading images. Tripod stand is used to place the camera steady while capturing images.
To keep your camera safe from any external damage a case is necessary. However these days the cases that come in the market are not solely for protection but more for attraction. They are neatly and attractively designed to make the overall look all the more presentable. The cases may be made in leather or with different materials. Besides these days there are waterproof cases too.
Travel bag, wrist strap, shoulder bag, etc are the accessories used to carry the camera more comfortably.
There are thousands of general as well as online shops in the market where you can buy cameras & camera accessories and can get the more information on these products.