The Linear Sequential Model is also known as the Waterfall Model. This model is a software development process in which the development cycle flows sequentially from start to finish in a linear manner. The model was first introduced in 1970 by Winston W. Royce and has since been widely used in software development projects.

The Waterfall Model is divided into several phases, and each phase must be completed before moving on to the next one. The phases are:

1. Requirements gathering and analysis
2. System design
3. Implementation
4. Testing
5. Deployment
6. Maintenance

The model is called the Linear Sequential Model because it follows a linear sequence of phases. Each phase must be completed before moving on to the next one, and there is no going back to a previous phase once it is completed.

Advantages of the Waterfall Model include its simplicity, ease of use, and clear documentation. The model also allows for a thorough understanding of the requirements before moving on to the implementation phase, which can help prevent errors and reduce the need for rework.

However, the Waterfall Model has some disadvantages as well. One of the main disadvantages is that it is not well-suited for complex projects or projects with changing requirements. Additionally, the model does not allow for much flexibility or adaptation during the development process.

In summary, the Linear Sequential Model is also known as the Waterfall Model. It is a software development process that follows a linear sequence of phases, and each phase must be completed before moving on to the next one. While the model has some advantages, it is not well-suited for complex projects or projects with changing requirements.