In the ancient times a door , a window was just a passage way to move from the shelter to the outside world . With the ongoing evolution of thinking of people changed and windows and doors were created to perform certain functions like ventilation , entering of sunlight and few more in today's world people like architect , builders , window consultants , fabricators , even the end user has high expectations from windows and doors. Besides its basic features of water tightness and air tightness an intensive research and development process is carried where the air pressure is measured so that there is maximum wind resistance , various methods are tried to cut down unnecessary noise so that you can have a peaceful living , various tests are conducted like fire resistance , anti burglary so that there is no compromise over your security and of course windows are designed and to match your aesthetic requirement .