system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What does megapixel mean?

Is it a general measure of a camera's picture quality?
gpt
Megapixels is a million pixels. Digital cameras produce images formed by many tiny colored square dots called pixels, and the more you have the more detailed an image can be. Broadly speaking they tend to tell you the quality a camera can produce, in the sense that a 2 megapixel camera can’t make as detailed a photo as a 30 megapixel camera.

However it isn’t a foolproof metric because having a bunch of pixels doesn’t mean they are *good* pixels. Cameras can have a bunch of pixels but have a lot of noise or poor color reproduction compared to a camera with fewer but higher quality pixels.