Software Quality Assurance maintain a most important role

Software Quality Assurance (SQA) is simply a way to assure quality in the software. It is the set of activities which ensure processes, procedures as well as standards are suitable for the project and implemented correctly. 

Software Quality Assurance is a process which works parallel to Software Development. It focuses on improving the process of development of software so that problems can be prevented before they become a major issue. Software Quality Assurance is a kind of Umbrella activity that is applied throughout the software process. 
Software Quality Assurance (SQA) encompasses
SQA process Specific quality assurance and quality control tasks (including technical reviews and a multitiered testing strategy) Effective software engineering practice (methods and tools) Control of all software work products and the changes made to them a procedure to ensure compliance with software development standards (when applicable) measurement and reporting mechanisms
Benefits of Software Quality Assurance (SQA)
SQA produces high quality software. 
High quality application saves time and cost. 
SQA is beneficial for better reliability. 
SQA is beneficial in the condition of no maintenance for a long time. 
High quality commercial software increase market share of company. 
Improving the process of creating software. 
Improves the quality of the software. 
It cuts maintenance costs. Get the release right the first time, and your company can forget about it and move on to the next big thing. Release a product with chronic issues, and your business bogs down in a costly, time-consuming, never-ending cycle of repairs.
Disadvantage of Software Quality Assurance (SQA)
There are a number of disadvantages of quality assurance.
Software Quality Assurance (SQA) maintain a most important role in the ensuring the quality, reliability and efficiency of the product. By implementation of these control process which cause the improvement of the software engineering process. SQA gives a higher quality product which help to meet user expectations, its having some drawback also like Cost, time-consuming process, after maintaining the process of the SQA its improved the reliability and maintain the maintenance cost which affect in a future.
Software quality assurance is a planned and systematic plan of all actions necessary to provide adequate confidence that an item or product conforms to establish technical requirements.

A set of activities designed to calculate the process by which the products are developed or manufactured.
Software quality assurance is composed of a variety of functions associated with two different constituencies ? the software engineers who do technical work and an SQA group that has responsibility for quality assurance planning, record keeping, analysis, and reporting.
The program is developed during project planning and is reviewed by all stakeholders. The plan governs quality assurance activities performed by the software engineering team and the SQA group. The plan identifies calculation to be performed, audits and reviews to be performed, standards that apply to the project, techniques for error reporting and tracking, documents to be produced by the SQA team, and amount of feedback provided to the software project team.

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