These days, High-Definition technology is present almost everywhere, from cameras to TVs or surveillance cameras placed on airports or streets. High-Definition (or HD) means that the resolution of the images is bigger than the Standard Definition (SD), resulting in clearer and bigger images which display more details. The resolutions for HD are usually 1280 over 720 pixels or 1920 over 1080 pixels in full-HD. In comparison with the classic image resolution which has been used for decades, like 640 over 480 pixels, the HD resolutions are considerable bigger and provide a greater quality for the images. There are HD TVs or HD cameras that use this technology successfully.
In addition to a bigger resolution, images are also displayed differently on a HD TV, for example. If the classic standard CRT TVs or monitors draw images on verticals and horizontal lines and the quality was lost during the transmission, for a HD TV the pictures are drawn digitally, using combinations of 0 and 1. There are two methods used to display the images on a HD TV screen. One of it is called progressive scanning and it draws the image entirely.
The second method is called interlaced scanning and it draws only the odd number of lines for half of the image field and even number of lines of the other half of the image field. This is a rather complicated process, but it provides astonishing results. You do not have to be a professional to realize that HD technology is way better than everything else at this moment.
HD technology is implemented in cameras as well, giving those cameras the possibility to capture images with maximum resolution and quality.