Cybersecurity protects data using a defence-in-depth model with multiple layers of protection. This includes technical controls such as encryption (making data unreadable without authorisation), next-generation firewalls (blocking malicious traffic), endpoint detection and response (protecting laptops and servers), access controls (ensuring only authorised users can access sensitive data), and continuous monitoring for signs of a data breach. Mercury IT implements these layered defences aligned to the Essential Eight framework recommended by the Australian Cyber Security Centre.