Fictional technology is an umbrella term for technological processes and devices that don't exist in reality, proposed or described in many different contexts:
Exploratory engineering seeks to identify if a prospective technology can be designed in detail, and simulated, even if it cannot be built yet - this is often a prerequisite to venture capital funding, or investigation in weapons research.
Advertising which emphasizes some amazing potential of some technology that is "under development" (usually without any specific timelines) by a company that is seeking simply to present itself as being competent with technology. See also vaporware, persuasion technology.