Many organisations around the world use Citrix ADC (formerly NetScaler) for load balancing web services, making web services highly available, offering secure VPN or ICA access to staff and so on. If your organisation uses Citrix products such as Virtual Apps and Desktops, you probably also make use of an ADC to provide secure ICA proxy to apps and desktops, and load balance Citrix and non-Citrix services. The ADC can do a lot of things, often known as the swiss army knife of networking.