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The so-called software life cycle, as the name implies, refers to the life cycle of software from production to cessation of use.

SDLC, Software Development Life Cycle is a process used by software industry to design, develop and test high quality softwares.

SDLC (Software Development Life cycle) is a process that involves high-quality software design, development and testing.

Generally speaking, the software development life cycle consists of the following processes:

The software life cycle is generally like these processes. In the process of software development, developers have summed up more and more tired development experience, and some changes have taken place in the software development process. From the beginning of the waterfall model to the later agile development, test-driven development, prototype development, all evolved step by step, these models are sorted out as follows:

Waterfall model: the waterfall life cycle includes feasibility analysis and development project planning, requirements analysis, design (summary design and detailed design), coding, testing, maintenance and so on. Waterfall model is a classical software development model. Disassemble the software into a product that can be implemented step by step, and do different things at different stages.

Iterative model: the iterative model means that the software product is regarded as a finished product that can be developed step by step. For example, if we write a website and quickly develop a finished product and release it, the finished product can be used, but it is not perfect and needs to be done step by step. Many of the current Internet products are based on this idea, rapid construction and iterative layer by layer.

Rapid prototyping model: the rapid prototyping model is actually the first time to show users the software products to be developed in a very intuitive way, which to a certain extent makes up for the shortcomings of the waterfall model and gives users an intuitive sense of image. however, in the process of later development, the prototype design may have to be knocked down and started all over again.

There are many other models, because of the randomness and uncertainty of the software development process, any model may not be able to really describe the actual software development process, after all, the theory and practice are not the same, especially in the field of software engineering. Therefore, we can not rigidly adhere to a certain development model, but in the actual work to adapt to the situation, to be a theoretical practitioner.

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