Glue records are a type of DNS record that maps a domain name or subdomain to an IP address or set of IP addresses used by a load balancer, such as Amazon Route 53 or Cloudflare. They are used to ensure that traffic is directed to the correct servers, even if the IP addresses of those servers change.
Glue records are important because they help to ensure the availability and reliability of your website or application. Without glue records, traffic may be directed to incorrect servers, resulting in downtime or errors.