Do you want to monitor the situation of your home/office/factory/ shop/supermarket when you are not in ?
Do you need to get video record or pictures to be sufficient proof when there is accident happen ?
Do you want to see and hear your family members when you are far from home ?

As long as you can go to internet, you can realize all above by the IP cameras.
Easy install the IP cameras---just link them to Modem or Router, then install a software.