Which software development methodology emphasizes iterative and incremental development, close team collaboration, and delivering working software in short, fixed-length cycles commonly called 'sprints'?

Agile methodology, particularly the Scrum framework, organizes development into short, fixed-length iterations called sprints (typically 2-4 weeks), emphasizing close collaboration, continuous feedback, and delivering working, potentially shippable software at the end of each sprint. The Waterfall Model follows a strict, linear sequence of phases with no iteration. The Spiral Model combines iterative development with structured risk analysis, but is not built around the 'sprint' concept. The V-Model pairs each development phase with a corresponding testing phase. The Big Bang Model has little to no planned process or structure at all.