The DNS records are simple text-based instructions related to a specific domain name. They are collected in a zone file in a DNS zone. Moreover, all of that information is kept in the authoritative DNS server for the domain name. The DNS records have one main purpose – to provide the needed information and rules for a domain, for instance, the IP address. We should mention that the DNS records could be of various different types. Each type of DNS record is created for a specific intention. Read more about some of the most popular DNS record types.
DNS propagation refers to a particular amount of time that is required for updating the DNS data (DNS records) in the entire global network of servers. These changes do not happen instantly because nameservers are designed to keep the DNS information in their cache memory for a specific time period defined by the TTL (Time-to-Live) values. Once it expires, the servers are able to check and refresh their data. For that reason, it is best if you plan well your DNS changes. That is going to minimize the chance for you to experience downtime. Find out additional information about DNS propagation!