What Is Agile Software Development?

What Agile is

Agile is an approach to software development that emphasizes building software in small, iterative steps, collaborating closely, and adapting to change rather than following a rigid, fixed plan. Instead of trying to design everything upfront and build it all at once, Agile teams deliver working software in frequent increments, gather feedback, and adjust as they go. Agile has become one of the most influential ways of building software, reshaping how teams across the industry organize their work.

The problem it addressed

Older approaches often tried to plan an entire project in detail upfront, then build it over many months before anyone saw the result. This frequently led to software that was late, over budget, or no longer what users needed by the time it arrived, because requirements and understanding change. Agile emerged as a response: rather than betting everything on a fixed upfront plan, it embraces the reality that needs evolve, and builds in a way that can adapt.

Core values

Agile is guided by a set of values that prioritize individuals and collaboration, working software, customer involvement, and responding to change. In short, it values people and communication over rigid process, delivering working software over exhaustive documentation, close collaboration with users over fixed contracts, and adapting to change over blindly following a plan. These values do not reject planning or documentation, but they emphasize flexibility and real results over rigid adherence to an upfront blueprint.

How Agile works in practice

Agile teams typically work in short cycles, often called iterations or sprints, delivering a small, working piece of software each cycle. They regularly review progress with stakeholders, gather feedback, and adjust priorities for the next cycle. This creates a continuous loop of building, showing, learning, and improving. Rather than a single long march to a distant finish, Agile is a steady rhythm of small deliveries, each one an opportunity to course-correct based on what has been learned.

Agile vs. waterfall

Agile is often contrasted with the traditional 'waterfall' approach, where a project flows through sequential phases, requirements, design, building, testing, in order, with each completed before the next begins. Waterfall can work when requirements are truly fixed and well understood, but it struggles with change. Agile instead iterates and adapts throughout. Neither is universally best, but Agile's flexibility suits the common reality that software requirements evolve as a project progresses.

Why it matters

Agile transformed how much of the software industry works, making development more flexible, collaborative, and responsive to change. Understanding it clarifies why modern teams build in small increments, seek frequent feedback, and adapt their plans, and how this differs from older, rigid approaches. For anyone interested in how software is actually built today, Agile is a foundational concept that shapes the daily work of countless development teams.

Related on Skillo

See also: What is Scrum? Explained simply, What is DevOps? Explained simply.

Sources

• Agile software development - Wikipedia

Published date reflects the original event date (2023-09-12). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.