The GÉANT Testbeds Service (GTS) delivers integrated virtual environments as “testbeds” for the network research community. The network testbed resources are dynamically allocated from real e-infrastructure distributed throughout the ​GÉ​ANT core service area allowing researchers to define, build, test and re​build highly scalable, high capacity virtual networks quickly, easily and cost-effectively.​ Rapid virtual prototyping ​​​ With GTS, users can easily build high performance heterogeneous virtual environments across the WAN required for their experiments. And they can do so in just a couple of minutes. This allows them to focus on the actual experiments and not on the underlying infrastructures necessary to carry out the work. Such flexibility enables rapid prototyping and facilitates early stage innovation in Internet scale applications and services. This capability not only aids the network research community, but allows the science community to develop large scale application specific networks linking instruments, computational facilities, and researchers via an intelligent and user controlled e-infrastructure spanning Europe.