Arista Networks makes and sells high-performance Ethernet switches, routing hardware, and campus networking gear. Its core business is supplying the switching fabric inside large data centers and AI computing clusters — the physical infrastructure that moves data between servers, GPUs, and storage at high speed. Arista's primary differentiator is EOS (Extensible Operating System), a single consistent OS that runs across its entire hardware portfolio, from small campus switches to large AI data center spines. On top of EOS sits CloudVision, Arista's centralized network management and automation platform. Large cloud operators and AI companies account for roughly half of revenue, with Microsoft and Meta each exceeding 10% of FY25 revenue individually. Enterprise customers in financial services, healthcare, and manufacturing make up most of the remainder. Arista sells through a direct sales force and channel partners. Revenue is driven by the volume of switch ports shipped, price per port (which rises with each speed transition — 100G to 400G to 800G), and a growing software and services attach rate from A-Care support and CloudVision subscriptions. Manufacturing is outsourced to contract manufacturers in Asia and Mexico, and Arista relies on Broadcom as its primary chip supplier, keeping capital intensity low. Arista's two growth priorities are AI networking — targeting $3.25B in AI-related revenue in FY26 — and enterprise campus networking, where Arista is pushing toward $1.25B in campus revenue in FY26, recently bolstered by the acquisition of SD-WAN vendor VeloCloud.