Surveillance is a practice that is as old as humanity itself. Humans have always had to watch their surroundings in order to ensure their own safety. Things have not changed much, fundamentally speaking since ancient times. What has changed however, is our tools for conducting surveillance.  digital surveillance systems  of all kinds is where it is all currently being focused. Analog systems have long been in place before digital surveillance systems but these were often hard to use, bulky, and expensive. Digital technology has allowed even those with meager budgets to have a good quality surveillance system.