Agile methodologies are a set of principles and practices that are used to develop software and other products in an iterative and incremental manner. These methodologies prioritize customer satisfaction, collaboration, and flexibility over rigid processes and documentation.

Some of the most popular agile methodologies include:

1. Scrum: A framework that emphasizes teamwork, communication, and iterative development cycles called sprints.

2. Kanban: A visual system that focuses on continuous delivery and workflow management.

3. Lean: A methodology that aims to eliminate waste and optimize value delivery.

4. Extreme Programming (XP): A methodology that emphasizes continuous testing, frequent releases, and customer involvement.

Agile methodologies are often used in software development, but they can also be applied to other industries and projects. They are designed to help teams work more efficiently, respond to changes quickly, and deliver high-quality products that meet customer needs.