Forensic photography is a way to take pictures of crime scenes and evidence so that we can study them later and figure out what happened.
A very long time ago, people didn't have cameras, so they had to draw pictures of what they saw at crime scenes. But drawings were not very accurate or reliable, because people might forget what they saw, or not draw things to scale.
In the early 20th century, cameras became more common, and forensic photographers started using them to take pictures of crime scenes. They would use special film and techniques to make sure the pictures were clear and detailed.
One famous forensic photographer, Alphonse Bertillon, even came up with a system for measuring people's bodies and facial features to help identify suspects. This system was used until fingerprinting became more popular.
Today, forensic photography is still an important part of investigating crimes. The pictures can help us see details we might miss, or compare evidence from different places. And with digital cameras, we can even enhance and manipulate pictures to make them clearer and more useful.