The Blue Coat SG family of appliances delivers a scalable proxy platform architecture to secure Web communications and accelerate delivery of business applications. 

Based on a custom, object-based operating system with integrated caching and compression, these proxy appliances leverage existing authentication systems to enable flexible policy enforcement on content, users, applications and protocols. 
Blue Coat SG appliances are typically deployed:

1. At the Internet gateway (forward proxy) to protect internal users and networks from spyware, phishing attacks, inappropriate web usage, and potential legal liability - while actually improving web performance.
2. At the edge of an organization's application delivery infrastructure for controlled acceleration of key business applications, including file services, rich media applications, and e-mail. 
3. In the DMZ (reverse proxy) to securely isolate web servers from direct Internet access and accelerate web-based applications and public websites.

Each Blue Coat SG appliance includes our patented Policy Processing Engine, which enables sophisticated policies based on a wide range of attributes to provide unmatched visibility, flexibility, and control. 

Delivered as a rack-mountable appliance for simple installation and management, Blue Coat SG is offered in a wide range of sizes and configurations appropriate for remote / branch offices, Internet gateways, data centers, and global service providers.