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VDI (Virtual Desktop Infrastructure) is a desktop delivery model where full desktop operating systems run as virtual machines on centralized servers, and users reach them remotely from whatever device they have on hand. Each user gets a whole OS instance to themselves, unlike session-based computing, where everyone shares one server OS. This is what most "vdi meaning" searches are actually after: centralized desktops, delivered over a remoting protocol.
A desktop OS runs on a server or in the cloud and gets streamed to whatever device the user is holding.
A hypervisor layer hosts pools of desktop VMs. A connection broker authenticates users and hands each one a desktop from the right pool. A remoting protocol, RDP, Blast, or PCoIP depending on the platform, carries the desktop's display to the user's endpoint and sends input back the other way. Profile and image management keep everything consistent: golden images define the OS and apps, and user data persists independently of any one VM.
Persistent desktops assign each user a dedicated VM that keeps changes between logons. It is the closest thing to actually owning a PC, and it costs the most in storage and management to match. Non-persistent desktops are stateless instead: users draw a fresh VM from a pool every session, with profiles layered in at logon. That simplifies patching (update the image once, done) and shrinks storage, but only if the profile layer is engineered well, which is easier said than done. Most real environments mix both: persistent for developers and power users, non-persistent for everyone else doing task work.
The gains are real. OS-level isolation per user, broader application compatibility than multi-user session platforms since each desktop runs a full client operating system (application licensing, peripherals, and infrastructure dependencies still matter, of course), centralized data, uniform patching across the board. The costs are just as real. Per-user VM density runs far lower than session density ever would, storage and licensing pile up fast, and the platform demands genuinely specialized operations to run well. Those economics are exactly why session-based RDS has never gone away. Full comparison: VDI vs RDS →
The established platforms are Citrix (Virtual Apps and Desktops, and Citrix DaaS), Omnissa Horizon (formerly VMware), Azure Virtual Desktop for Azure-hosted deployments, and Parallels RAS down in the mid-market. Platform choice drives protocol, management tooling, and licensing model together, and each one has a distinct enough cost profile that it is worth comparing before signing anything.
Virtual Desktop Infrastructure.
Not quite. VDI runs on VMs, but the term means the whole delivery system: hypervisors, broker, images, protocol, all of it together, not just a lone VM sitting somewhere.
Same desktop model, different operator. VDI is self-hosted and self-managed. DaaS is the provider-operated version of the same idea. See DaaS →
VDI can keep application processing and data centralized, but clipboard and drive redirection, downloads, and endpoint policies are what actually decide whether data can leave that hosted environment. Access security, MFA, exposure, least privilege, is what decides the real-world safety, not the architecture diagram.
Where TruGrid fits. TruGrid SecureRDP delivers secure access to virtual desktops without exposing brokers or gateways to the internet, and it often makes an existing RDS estate competitive with full VDI, at a fraction of the cost. Compare approaches →
TruGrid SecureRDP delivers Zero Trust remote desktop access: MFA, least privilege, and zero open inbound ports.
Explore SecureRDP →
TruGrid simplifies Access and Device Security for organizations by reducing complexity and associated costs.
