Before purchasing a CCTV Security Camera, it is the image sensor which we look for in the first place. Image Sensors are something which one should try to understand and find out first in a Security Camera, even before the parameters like TV Lines, or IR, or Focal Length. As evident from the title of this post also, we shall be talking about the two types of Image Sensors majorly available n the market, and the ongoing war between them. These two types of sensors are CCD and CMOS Sensors. CCD stands for Charged Coupled Devices, and CMOS stands for Complementary Metal Oxide Semiconductor.