The internal IP is generally set as dynamic within the router/ modem, this will but not always change each time the device requesting access to an outside network is turned on, or active.
The ISP, or Internet Service Provider , also as a rule sends dynamic IP's to the modem, the modem will them "lease" out dynamic IP's to devices on the internal network. Business class connections, servers ect. would need a static IP, so it can be arranged with something humanly memorable in the form of a URL or, website name then is stored on a DNS Domain Name Server, which allows the request to be answered , and directed faster, without a huge worldwide search of every connected device on the internet.
Each device is generally capable of being set up with a static IP from within the IP server, or router.
Hope that helped, if you need more , ask
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