Security
CA
Abbreviation for Certification Authority
In short and in plain language
A CA is a body that gives out digital certificates for sites.
Each one shows that a safe link belongs to the named site.
The browser checks if it can trust the body that gave it out.
Definition
A CA is a certification authority that issues digital certificates for websites. The certificate confirms that an encrypted connection belongs to the stated domain. Browsers check whether the issuing authority is listed as trustworthy.