SSL Certificate
Definition
A digital credential that authenticates a website's identity and enables encrypted HTTPS connections between the web server and visitors' browsers.
An SSL certificate is a data file installed on a web server that activates the padlock icon and HTTPS protocol in browsers, establishing an encrypted link between the server and the client. The certificate contains the domain name, the certificate authority that issued it, the public encryption key, and an expiration date.
SSL certificates come in three validation levels: Domain Validation (DV) simply confirms domain ownership and is available free through services like Let's Encrypt. Organization Validation (OV) verifies the organization's legal identity. Extended Validation (EV) requires thorough vetting and traditionally displayed the company name in the browser address bar, though most browsers have phased out this visual distinction.
Every website should use an SSL certificate because major search engines penalize non-HTTPS sites in rankings, browsers display security warnings on unencrypted pages, and encrypted connections protect user data from interception. SSL certificates need renewal, typically every 90 days for free certificates or annually for paid ones, and misconfigured certificates cause trust errors that drive visitors away.
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Related Calculators
Related Terms
SSL/TLS (Secure Sockets Layer / Transport Layer Security)
techCryptographic protocols that provide secure communication over computer networks, encrypting data between a web server and browser.
DNS (Domain Name System)
techThe internet's phone book that translates human-readable domain names like example.com into numerical IP addresses that computers use to communicate.
HTTP (HyperText Transfer Protocol)
techThe foundational protocol for data communication on the web, defining how messages are formatted and transmitted between clients and servers.
Encryption
techThe process of converting readable data (plaintext) into an unreadable format (ciphertext) using an algorithm and key, protecting it from unauthorized access.
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