Pixel can be a small block of information that when they are displayed together form a picture. Can not thousands or even millions of photos. The term “pixel” is for “picture element” short. Each pixel carries information about color, appears as light, and the power of color. Definition of the functions that they can get more technical, but I’m still very simple here. It is among the millions of pixels in an image, the human eye can not see them as individuals. When they were all together, we see them as continuous tones, or the actual image.

Dictate pixel resolution. This is to see how many details we do. The simplest example of how much the image when enlarged. The more pixels in the image, the higher the resolution. The resolution is measured in pixels per inch, or ppi. 300 ppi is standard for most cameras. Standard PC monitor to a different pixel. For Windows is 72ppi. For Mac 96ppi. So if you take pictures and want to know him only for computer screens and do not use the printer, you can connect the camera with a resolution much lower and still a great picture for your screen.

Pixel size determines the maximum extension of print quality.
Let’s say you shoot at 300ppi.

A 3-megapixel camera give you a good print 5×7 or smaller.

A 6-megapixel camera give you a good print 8×10 or smaller.

A 10-megapixel camera give you a good print 13×8 or smaller.

These are all approximate. This information can be useful if you select the camera. This will also help you, the size of the extension is the best picture without having a quality.