Static IP
A fixed IP address that never changes, either set on the device or reserved on the router.
A server should always have a static IP (a DHCP reservation is the easiest way) so port forwards, reverse-proxy rules and bookmarks keep working after a reboot.
Related articles
DHCP(Dynamic Host Configuration Protocol)
A service that automatically assigns IP addresses and network settings to devices as they join the network.
IP Address
A numeric label that identifies a device on a network, such as 192.168.1.10 (IPv4).
Reverse Proxy
A server that sits in front of your services, routing requests by domain name and handling TLS certificates.