All the six phases of the software development life cycle work differently and contribute differently to the development of any software.
The first phase of SDLC is the planning and requirement phase in which the developer plans software according to the requirements of the customer and identifies the risk in the project. The second stage is defining requirements in which a developer actually makes a list of the required data and needs which we call an SRS.
A Software requirement specifications (srs) document, which includes all the product requirements to be planned and produced throughout the project life cycle, is used to do this. The third phase is designing the product architecture or the blueprint of the product which is made with the help of an SRS. the fourth phase is building and developing the project based on the blueprint that was made in the third phase of SDLC.