An SSL certificate is a digital certificate that authenticates a website's identity and enables encrypted connections between a web server and a browser. SSL stands for Secure Sockets Layer, a security protocol that ensures data transmitted between users and websites remains private and secure. When a website has an SSL certificate, its URL begins with 'https://' and displays a padlock icon in the browser's address bar. This certificate is issued by a trusted Certificate Authority (CA) after verifying the website owner's credentials. SSL certificates are essential for protecting sensitive information, such as login credentials, payment details, and personal data, from cybercriminals. However, scammers can also misuse SSL certificates to make malicious sites appear trustworthy, so users should remain vigilant.