It could not have evolved. So that is why it is important to figure out if information can come from a random process or not. It is so overused that many people are sick and tired of hearing the term. But it does illustrate an important point. Let's talk about images first.
Images are patterns of colored dots.
It takes a certain number of bits to transmit each pixel. You can multiply the number of bits per pixel times the number of pixels per image, and that will tell you the maximum number of bits of information the picture can contain. Images rarely contain that maximum number of bits of information. How this is actually done is irrelevant. The point is that ways exist to determine the amount of information in an image and the minimum number of bits needed to transmit the image.