What is the difference between waterfall and agile methodologies in SDLC ?

AGILE METHODOLOGIES:

The Agile methodology promotes the continuous interaction of the development and testing during the SDLC process of any project. Unlike the waterfall model, the development and testing activities in the agile model are simultaneous. Agile methodology allows much communication between the customers, developers, testers, and managers.

In the Agile method, the entire project is divided into small incremental builds. All of these builds are provided in iterations, and each iteration lasts from one to three weeks.

1.Agile focuses on customer feedback, collaboration, small and rapid releases.
2.Its purpose is to manage complex projects.
3.The Agile produces better application suites with the desired requirements. Moreover, it can quickly adapt according to the changes made on time during the project life.
4.It has a small team size. Therefore, fewer people work on it so that they can move faster.

Waterfall model:

It is one of the easiest and traditional model to manage. Because of its traditional development nature, each phase has specific deliverables and a review process. The waterfall model works well in smaller size projects where requirements are easily understandable.

The waterfall model is a universally accepted SDLC model. In this method, the whole process of software development is divided into various phases. The development in the waterfall model is seen as flowing steadily downwards (like a waterfall) as it is a continuous software development model. This model is named "Waterfall Model", because its diagrammatic representation resembles a cascade of waterfalls. Some important points related to the waterfall model are listed as follows -

1.Waterfall model is not an ideal model to develop a large scale project size.
2.The requirements in the waterfall model should be clear cut at the beginning time; otherwise, it may lead to a less effective method.
3.In the waterfall model, it is hard to move back in order to make changes in the previous phase.
4.The testing process in the waterfall model starts after the completion of development. So, there is a high chance of bugs to be found later in the project development.