Agile software development is a set of principles for software development in which requirements and solutions evolve through collaboration between self-organizing, cross-functional teams.
It promotes adaptive outlining, evolutionary development, early delivery, and continuous improvement, and it encourages rapid and flexible response to change. Agile itself has never defined any specific methods to achieve this, but many have grown up as a result and have been recognized as being ‘Agile’.
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The Agile Manifesto is based on twelve principles

Customer satisfaction by early and continuous delivery of valuable software
Welcome changing requirements, even in late development
Working software is delivered frequently (weeks rather than months)
Close, daily cooperation between business people and developers
Projects are built around motivated individuals, who should be trusted
Face-to-face conversation is the best form of communication (co-location)
Working software is the principal measure of progress
Sustainable development, able to maintain a constant pace
Continuous attention to technical excellence and good design
Simplicity—the art of maximizing the amount of work not done—is essential
Best architectures, requirements, and designs emerge from self-organizing teams
Regularly, the team reflects on how to become more effective and adjusts accordingly

Reference : https://blog.chiefsoft.com/2016/07/23/agile-software-development/

Great post!
I think that article will be useful too: https://codetiburon.com/earned-value-management-evm-agile-software-projects/

Basically, Agile refers to software development methods that emphasize incremental delivery, team communication, continuous planning, and continuous learning rather than aiming to release everything at once towards the end.

Agile emphasizes keeping the process lean and developing minimal viable products (MVPs) that go through several iterations before being finalized. Feedback is constantly received and applied, resulting in a much more dynamic process in which everyone is working toward a common objective.

Agile is good for adding new simple features to an application you can release bit by bit. If you are starting a new project then it comes under a different methodology like Waterfall, SDLC, RUP etc

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