IP Address
A numeric label that identifies a device on a network, such as 192.168.1.10 (IPv4).
Devices get a private IP on your LAN and share one public IP to the internet. Servers should use a fixed private IP so they're always reachable at the same address.
Related articles
Static IP
A fixed IP address that never changes, either set on the device or reserved on the router.
Subnet
A logical subdivision of an IP network, defined by a mask that separates the network and host portions of an address.
NAT(Network Address Translation)
The router technique that lets many private devices share one public IP address.