To save a point in time event by storing them at the time of light conditions on an ISO over the exposure device called a camera then those light conditions can be changed back into a picture again.
The event at a particular time. By keeping the light on the object at that location through a device sensitivity. Exposure is called camera can then be converted back to light those pictures again. Clear visual processing
The event log at the point of any one time by keeping the light conditions at that time on the light sensitive objects through equipment. Light called camera after that can change them back to a light image again.