Software testing

https://en.wikipedia.org/wiki/Software_testing

Defects management & Quality Attributes
vs Quality Management / Assurance
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Azure Test Plans
DevOps Verify

Snippet from Wikipedia: Software testing

Software testing is the act of examining the artifacts and the behavior of the software under test by validation and verification. Software testing can also provide an objective, independent view of the software to allow the business to appreciate and understand the risks of software implementation. Test techniques include, but not necessarily limited to:

analyzing the product requirements for completeness and correctness in various contexts like industry perspective, business perspective, feasibility and viability of implementation, usability, performance, security, infrastructure considerations, etc.

reviewing the product architecture and the overall design of the product

working with product developers on improvement in coding techniques, design patterns, tests that can be written as part of code based on various techniques like boundary conditions, etc.

executing a program or application with the intent of examining behavior

reviewing the deployment infrastructure and associated scripts & automation

take part in production activities by using monitoring & observability techniques
Software testing can provide objective, independent information about the quality of software and risk of its failure to users or sponsors.

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