Implementation

The Simple English Wiktionary has a definition for: implementation.

Implementation is the realization (or making real) of an application, or making real: a plan, an idea, model, design, specification, standard, algorithm, or policy.

Implementation may be:

• Implementation (computer science), making real a technical specification or algorithm as a program, software component (or part of software), or other computer system through computer programming and letting the software be used by end users (or customers of the software).
• Implementation (political science), carrying out of - or making happen - public policy.