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STEP, for STandard for Exchange of Product model data, is aimed to support a complete and unambiguous description of industrial products all along their life cycle, independently of any computer system (operating system, hardware, CAD software...).
It is a strategic matter in the domain of CAD data exchanges, to support this standard to ensure that applications can communicate with each other in a collaborative engineering process.
Designing, producing, maintaining… a product generates and uses various kinds of information from the beginning to the end of its lifecycle. These informations are created and used by various systems, softwares, etc… at different times, which can moreover be located in several sites.
To satisfy such constraints involves to keep completeness and consistency of product data when exchanging them in such open frame: so a common, computer-interpretable form is needed to represent them.
So, to summarize, STEP provides a neutral way of describing informations relevant for a product, all the steps of its life cycle, relying on a set of general formalisms. Its general purpose is to allow communication between various systems in a company or between companies, in a distributed engineering context, by meeting these key criteria:
STEP is known and managed as an ISO standard, we can say a family of standards, because it covers numerous domains : it is organized in a series of parts, each of them is published separately (ISO series 10303, managed by ISO technical committee TC184/SC4).
Some of these parts are known as Application protocols (APs) to describe product data for an application or a consistent set of applications.
STEP uses a formal specification language, EXPRESS, for specifications: this enables precision and consistency of representations and makes implementations easier.
For more details here is a short list of web sites: