Digital cameras are of various types from a simple web-cam to a full fledge SLR digital cam. It captures image in various formats like jpg bmp on the digital memory.
After arrival of digital camera the world of photography have changed a lot. Many more people can try their hands at photography with lesser cost and lower effect on environment.
There are various parameters by which digital cameras are categorized with
Optical Zoom[]
Zoom is enlargement of the view achieved before clicking the photograph. Optical zoom is achieved by the lens. The camera rating of optical zoom is usually specified as *X optical zoom. ie 3X optical zoom gives you about 3 times closer image. In certain cameras additional lens can be added to achieve higher optical zoom
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Digital Zoom[]
Mega-Pixel[]
Digital photograph is made of thousands and thousands of dots. These dots are called pixel. Mega-pixel rating gives number of dots the camera would generate for a creating a photograph.
A 5MP camera will create a photograph with 5 x 1,000,000 pixel/dots in it. As a rule of thumb Higher the Mega-Pixel clearer the picture. Also if you want to print the photographs it is better to have a camera with 3MP minimum, while 5MP would be better.