Home automation is automation of a home, housework or household activity. Home automation may include centralized control of lighting, heating, air conditioning, home appliances, security devices such as locks of gates and doors, alarm etc. It also involves control of domestic activities, such as home entertainment systems, houseplant and yard watering or pet feeding, all to provide improved convenience, comfort, energy efficiency and security. Devices may be connected through a home network to allow control by a personal computer, and may allow remote access from the internet. They can also be controlled via applications installed in smartphones or tablets.