Why there is a dot in qualified domain name?

The dot in a qualified domain name (QDN) separates different levels of the domain hierarchy, indicating the structure of the domain. Each segment to the left of the dot represents a more specific level, with the rightmost part being the top-level domain (TLD), such as .com or .org. This hierarchical organization helps in efficiently locating and accessing resources on the internet. The dot at the end of a fully qualified domain name denotes the root of the DNS hierarchy, emphasizing its complete and absolute nature.