The amount of complexity by which a system is viewed or programmed. The higher the level, the less detail. The lower the level, the more detail. The highest level of abstraction is the entire system.

Software that translates a high-level request into the low-level commands required to perform the operation. The most common abstraction layer is the programming interface (API) between an application ...

The industry has begun to converge on the main characteristics that make up a software defined networking (SDN) architecture, as you can see in blog posts like those on the SDxCentral "must read list" ...