Title: Secure Sockets Layer (SSL) Author: Kriko Published: Feb 20, 2021 Last modified: Jul 13, 2026 --- 1. [Home](https://kriko.io/) / 2. [Glossary](https://kriko.io/glossary) / 3. S Letter # Secure Sockets Layer **(SSL)** **SSL** stands for Secure Sockets Layer. It is an older security protocol that enables an encrypted connection between a browser and a web server. In modern technical usage, SSL has been replaced by the more secure and up-to-date **TLS**, or Transport Layer Security, protocol. However, the term “SSL certificate” is still widely used in the industry and in everyday language. An SSL certificate is a digital certificate that allows a website to establish a secure connection over HTTPS. When a user visits a website, data is exchanged between the browser and the server. When this data exchange is encrypted through HTTPS, it becomes much harder for third parties to read or modify the transmitted information. For this reason, the SSL/TLS structure is critically important for websites that process personal data, account information, payment details or form submissions. The main purpose of an SSL certificate is to increase the security of communication between the user and the website. Sensitive information such as name, surname, address, phone number, email, password or credit card details is protected through encryption while being transmitted over the internet. This helps prevent malicious actors from easily reading the information. However, an SSL certificate alone does not guarantee that a website is trustworthy, honest or free from fraud. It only shows that the connection is encrypted and that the certificate has been issued for the relevant domain. One of the easiest ways to understand whether a website has an SSL certificate is to check the address bar. Websites using HTTPS usually start with `https://` and display a lock icon in the browser. The “S” in HTTPS stands for Secure. However, users should not rely only on the lock icon. They should also make sure that the domain name is written correctly, that the website really belongs to the brand they intend to use and that the page is not a fake copy. The SSL/TLS structure works with digital certificates and encryption keys. A private key is used on the server side, while a public key is associated with the certificate. When the connection is established, the browser verifies the certificate, creates a secure session and transfers data in encrypted form. This structure helps ensure confidentiality, confirms that the data has not been altered during transmission and verifies that the user is connecting to the correct server. For e-commerce websites, banks, public institutions, healthcare platforms, membership systems and payment pages, SSL/TLS usage is a basic security requirement. Transmitting sensitive data such as credit card information, identity details or account passwords over HTTP can create serious security risks. For this reason, all websites that collect user data should use HTTPS. Modern browsers may also mark pages that do not use HTTPS as “not secure.” SSL certificates can have different validation levels. Domain Validation, or DV certificates, verify only domain ownership. Organization Validation, or OV certificates, verify both the domain and certain organisation details. Extended Validation, or EV certificates, go through more comprehensive validation processes. Regardless of the certificate type, the most important point for users is that the connection is secure and that the website is served through the correct domain. SSL/TLS usage is also important for SEO. Google considers HTTPS as part of a secure web experience, and secure connections are an important technical requirement in modern web standards. However, an SSL certificate alone does not guarantee ranking success. It should be evaluated together with technical SEO, quality content, page speed, mobile compatibility, user experience and a trustworthy site structure. HTTPS is one of the basic technical standards of SEO, but it is not the entire strategy. After installing an SSL certificate on a website, technical checks should be completed correctly. 301 redirects from HTTP to HTTPS should be created, canonical URLs should point to the HTTPS version, sitemap and Search Console settings should be updated, and images, CSS, JavaScript and other resources should load over HTTPS. Otherwise, mixed content issues may occur. This can lead to browser warnings and damage user trust. In summary, an **SSL certificate**, together with the modern TLS infrastructure, is a fundamental security element that enables a secure and encrypted connection between a website and its users. It is essential for websites that process personal data and payment information. However, SSL only secures the connection; the quality of the website’s content, brand trustworthiness, data processing policies and overall user safety should also be evaluated separately. ## Discover it in the dictionary ### Data Visualisation Data visualisation is the practice of presenting information through charts, maps, diagrams and other visual formats. 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