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This type of service is most commonly used in remote devices (like security cameras, local servers, etc.). Dynamic DNS helps people not to lose access to their devices, regardless of the possible change of their home IP. Why is this happening? The ISPs usually rely on a dynamic allocation of IP addresses to the customers for a certain amount of time. When that time finishes, they will be given a new one.
Do I need this?
If you don't have a permanent, static IP address from their ISP (internet service provider.) This is the case for most private users and also some small businesses (e.g. coffee shops, cafes or small offices.)
This is where DDNS comes in. Instead of having to manually make changes to your services, your DDNS provider will periodically check for updates to your IP address (e.g. from every hour to every few days) and update the DNS record accordingly. Easy.
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What is dynamic DNS
Dynamic DNS (DDNS) is a service that keeps the DNS updated with a web property's correct IP address, even if that IP address is constantly being updated. Many web properties, such as APIs or websites, run on internet connections that have their IP addresses changed frequently; this creates a problem if the operators of those properties want to give a hosted resource a specific domain name
Why do IP change?
Large enterprises that run major web services require their ISPs to give them unchanging or 'static' IP addresses so they can operate using standard DNS practices. In contrast, smaller services tend to see their IP addresses changed by their ISPs quite frequently, so they require a dynamic DNS solution.
How does DDNS work?
There are a number of companies who offer dynamic DNS services with varying features and technologies. One very common method of enabling dynamic DNS is by providing users with software which runs on their computer or router. This software communicates with the dynamic DNS service provider anytime the IP addresses.