Secure Sockets Layer (SSL) is a standard security technology for establishing an encrypted link between a web server and a browser. This link ensures that all data passed between the web server and browsers remain private and integral. SSL is commonly used for securing data transfers, credit card transactions, and logins, and it is now the norm for securing browsing of social media sites. SSL certificates, indicated by 'https://' in the URL and a padlock icon in the browser, are essential for ensuring website security, building user trust, and are a ranking factor in search engine optimization (SEO).