A startup or start-up is a company or project undertaken by an entrepreneur to seek, develop, and validate a scalable business model.

A stealth startup is a type of startup company that operates quietly and in silence to outsiders, avoiding public attention.

a methodology for developing businesses and products that aims to shorten product development cycles and rapidly discover if a proposed business model is viable; this is achieved by adopting a combination of business-hypothesis-driven experimentation, iterative product releases, and validated learning.

Startup accelerators, also known as seed accelerators, are fixed-term, cohort-based programs, that include mentorship and educational components, and (sometimes) culminate in a public pitch event or demo day.

The Lean Startup: How Today's Entrepreneurs Use Continuous Innovation to Create Radically Successful Businesses is a book by Eric Ries describing his proposed lean startup strategy for startup companies.

The Macintosh startup sequence for Apple Macintosh (or Mac) computers includes hardware tests and diagnostics which can trigger the startup chimes and/or other instances of success or failure of the startup routines.