Fortinet is a cybersecurity company that sells hardware appliances, software, and subscription services to protect enterprise networks. Its flagship product is the FortiGate firewall, the world's most widely deployed network firewall by unit volume, with roughly 55% global unit market share. FortiGate appliances run FortiOS, a single operating system that natively integrates firewall, SD-WAN, VPN, and SASE capabilities. Fortinet also designs its own custom silicon (FortiASIC), which it argues delivers significantly better security processing performance than general-purpose CPUs — a capability no major competitor replicates. Fortinet sells to SMBs, large enterprises, governments, telecom carriers, and managed security service providers across three solution pillars: Secure Networking (built around FortiGate), Unified SASE (cloud-delivered security for distributed workforces via FortiSASE), and SecOps (tools for threat detection and response, including SIEM, SOAR, and EDR). Fortinet primarily sells through a two-tier channel model. Revenue splits roughly one-third product (hardware and software licenses) and two-thirds services (subscriptions and support recognized ratably over ~29-month average contract terms). Service revenue carries higher gross margins than product revenue, so as the service mix grows, blended margins expand. Fortinet's growth strategy centers on upselling its large installed base of roughly 800,000–1,000,000 customers from FortiGate into SD-WAN and FortiSASE, capitalizing on a firewall refresh cycle, and expanding into OT security and AI data center security.