DNS stands for Domain Naming System. This is the naming system that is meant to be used for naming all of the resources that are available on the internet. The DNS will be responsible for matching the names of the different resources to their IP addresses. LDAP means Lightweight Directory Access Protocol.
The main goal of this is to make sure that the directory information will be properly distributed over and accessed to the best of their abilities. One difference between the two is in terms of certificate handling. LDAP will also provide better answer sets as compared to DNS. Take note that the use of these two is very important, especially when doing interactive and automated communication.
The full meaning of DNS is the Domain Naming System, while the meaning of LDAP is the Lightweight Directly Access Protocol. DNS simply refers to the adopted naming system in hierarchical order, which is used for computers, services, on a private network, or secondary resources connected to the internet.
The DNS stores an IP address, and equates domain names to it, after which you will be directed to a web address, then to a device, provided it is connected to the internet. On the other hand, LDAP serves the purpose of maintaining and accessing directory information that is distributed over what is called an IP, which is Internet Protocol.
Certificate handling is another major difference between DNS and LDAP. DNS can only be updated manually, unlike LDAP, which has an option where you can add, rename entries, and also delete. The DNS is more widely used, and also easier to use than LDAP.