formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')

Null is a term used in computing to refer to the absence of any value or data. It is often represented as a special value or symbol, such as "null" or "None", to indicate that no valid or meaningful data is available. In programming languages, null can also be used to signify an uninitialized variable, an empty array, or a non-existent object. The use of null is important in programming because it helps to avoid errors and crashes that can occur when trying to manipulate or access non-existent or invalid data.