Private SSL Certificates

Private SSL certificates provide a cost-effective solution to secure internal servers, applications, and IP addresses that do not require public trust yet want to benefit from SSL/TLS encryption. With private SSL certificates, enterprises receive the same high level of security and certificate features of publicly trusted SSL certificates, but the certificates are issued using a private CA which allows for configurations not allowed in public certificates and lower prices.
 

Note: You can use publicly trusted certificates on internal servers, but this is not always necessary or desirable. Publicly trusted certificates are designed for use on public-facing websites, and they may not be appropriate for internal servers that do not require public trust.