What is the Software Development Life Cycle (SDLC)? Describe its phases.

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The Software Development Life Cycle (SDLC) is a structured process used to develop high-quality software systematically and efficiently. It defines the stages involved in software creation from initial idea to final deployment and maintenance, ensuring the product meets technical and user requirements.

Phases of SDLC:

1. Requirement Gathering and Analysis:
   In this phase, stakeholders identify and document business needs. Analysts gather functional and non-functional requirements through interviews, surveys, or documentation.

2. Planning:
   Based on gathered requirements, a detailed project plan is developed. This includes resource allocation, cost estimation, and scheduling. Feasibility studies are also conducted.

3. Design:
   Architects and designers create system and software designs. This includes high-level design (architecture) and low-level design (detailed modules, data flow). It serves as a blueprint for development.

4. Development:
   Developers write the actual code based on design documents. The software is built using appropriate programming languages, frameworks, and tools.

5. Testing:
   QA teams test the software to find and fix bugs. Various testing types (unit, integration, system, acceptance) ensure the product functions correctly and meets requirements.

6. Deployment:
   The software is released to users. It may be launched in stages (pilot, full rollout). Deployment tools and strategies ensure smooth installation and operation.

7. Maintenance:
   After release, the software is monitored for issues. Updates, enhancements, and bug fixes are applied to ensure long-term usability and performance.

The SDLC ensures software is delivered systematically, on time, and within budget while maintaining quality and meeting user needs.

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