The main purpose of an SSL certificate is to establish a secure and encrypted connection between a web server and a user's browser. This certificate verifies a website’s authenticity, ensuring that data exchanged is protected from interception during transmission. SSL (Secure Sockets Layer) enhances user trust by displaying visual cues, such as the padlock icon in browsers, indicating a secure site. By implementing SSL certificates, organizations can safeguard sensitive information, such as login credentials and payment details, and comply with regulations around data protection.