Evaluative or Matrix Light Metering

Typically, you'll only find this metering mode on DSLR cameras that include a number of metering choices. Evaluative metering is the most sophisticated technology. Not only does it take meter readings across your entire picture, but also searches a database of thousands of pictures and finds the one that best matches the kind of picture you're taking. Your camera then uses the exposure data of that picture to set the exposure for yours.