The main goal of this article is to know about Security. Security can be seen as a minute ingredient to the buildings communications, when essentially without it, the building and it is contents are at huge risk. In the present world in which we live, security has supreme significance. That is why it is significant to always look at the bigger picture, look for vulnerabilities in the building, staff, perimeter, etc. For example there is no point in fitting an external CCTV system, that can simply be covered or stolen due to a low roof height.