A "12-megapixel" camera refers to a device that captures images with a resolution of 12 million pixels. Each pixel is a tiny dot of color that contributes to the overall image quality. Higher megapixel counts generally allow for more detail in photos, making them suitable for larger prints or cropping without losing clarity. In practical terms, a 12-megapixel image typically measures around 4000 x 3000 pixels. This resolution is common in many smartphones and digital cameras, providing a good balance between image quality and file size. Devices like the iPhone and Canon cameras often feature this level of resolution.