Surveillance is the process of observing the activities of people in public places. In this type of process, people use different electronic devices to monitor the actions of people for e.g.-CCTV camera, mobiles phones etc. This method is mostly used by detectives and administrative authorities like police, FBI etc., to check unauthorized activities. Most of the people, who want to monitor the behavior of their employees etc., use this kind of method. Police uses this process for finding some clues related to criminals and robbers. Most commonly surveillance is used by government agencies to monitor the deeds of criminal people or to investigate the case.

Surveillance can be of many types like computer related surveillance etc. In this type of commotion, people monitor the data available on the internet. Second type of surveillance is based on mobiles and telephones, people use multimedia mobile phones to collect personal data. Third type of surveillance is done through cameras. Some people use maps for monitoring and some check the mental and physical features of people for observation. Some of them even take help of helicopter, special vehicle, and airplanes to monitor the activities of any person.

A number of devices are available in the market for these purposes. They are available at very good and affordable prices. With the help of these we can observe any unauthorized activity.