Glossary of common terms

Fear, Uncertainty and Doubt.

Negative statements made with no real supporting evidence designed to discourage people from taking a particular course of action.  This could be done with malicious intent (e.g. to put potential customers off a competing product), or innocently by passing on received wisdom that is incorrect.

Proof Of Concept - a prototype created to show that an idea is technically fesible.  While the prototype probably isn't suitable for real-world use, it provides a starting point for discussion and design of a real solution.