What is QS and testing?

Quality Assurance (QA) is a set of activities aimed at controlling the quality of software development processes. The main goal of QA is to prevent defects at all stages of the product lifecycle. This includes working with requirements, planning, development, testing, deployment, and support.

Testing is one of the stages of the QA process. Testing involves analyzing the software product to identify defects (discrepancies between actual behavior and expected behavior).

Key differences:

Characteristic	QA	Testing
Goal / Focus	Preventing defects, improving processes	Detecting defects
Scope of application	Entire development lifecycle	Specific stage of product verification
When conducted	Throughout the entire project	Usually after the development stage, but can also start at earlier stages
Who conducts	QA engineers, managers, all team members	QA engineers, testers
Result	Improved processes, a generally higher quality product	Detected defects, product quality report