A website firewall and an SSL certificate serve different but complementary functions. A website firewall, such as those offered by SiteLock, filters and monitors incoming traffic to block malicious requests and prevent attacks like SQL injections, cross-site scripting, and other attempts that could lead to a security breach. An SSL certificate, on the other hand, encrypts the data exchanged between your website and its visitors, ensuring that sensitive information such as login credentials and payment details is secure during transmission. While a firewall defends against attacks, an SSL certificate protects data in transit.