Not sure what a root CA certificate is or how it works? Let's break down what they are and why root CA certificates are at the heart of user trust., A root certificate is a special digital certificate issued and digitally signed by a Certificate Authority (CA) such as SSL.com. It represents the top level of trust in a certificate hierarchy., Certificate Authorities issue certificates based on a chain of trust, issuing multiple certificates in the form of a tree structure to less authoritative CAs. A root Certificate Authority is therefore the trust anchor upon which trust in all less authoritative CAs are based. A root certificate is used to authenticate a root Certificate Authority., The first chain, up to ISRG Root X1, provides the greatest compatibility because that root certificate is included in the most trust stores. The second chain, up to ISRG Root X2, consumes fewer bytes of network bandwidth in each TLS handshake., A root SSL certificate is the highest level of a security certificate in a hierarchy called the certificate chain. It is issued by a trusted Certificate Authority (CA), and this root certificate is used to sign other certificates, such as server or intermediate certificates., Root CA: A Root CA is the topmost Certificate Authority (CA) in a Certificate Authority (CA) hierarchy. Each Certificate Authority (CA) hierarchy begins with the Root CA, and multiple CAs branch from this Root CA in a parent-child relationship. All child CAs must be certified by the corresponding parent CA back to the Root CA..