Software Testing 

Software Testing is the process of executing a program or system with the intent of finding errors. The purpose of software testing is that the product performs each function intended, internal operation of the product performs according to specification and all internal components have been adequately exercised.

Software Testing is the process of executing a program or system with the intent of finding errors. It involves any activity aimed at evaluating an attribute or capability of a program or system and determining that it meets its required results. Software is not unlike other physical processes where inputs are received and outputs are produced. Where software differs is in the manner in which it fails.

Quality means the conformance to the specified design requirement. Being correct, the minimum requirement of quality, means performing as required under specified circumstances. Debugging, a narrow view of software testing, is performed heavily to find out design defects by the programmer.

Quality Assurance

QA is the process that focuses upon each and every role and their responsibilities in the development process and checks whether they are being accomplished as per the guidelines provided by the quality standards or not. It concentrates on process of the product and is done throughout life cycle. It is defect prevention method.

Quality Control

QC is the process which usually includes inspections and audit operations to segregate bad from good. It concentrates on specific products and is done after the product is built. It is defect-detection and correction method.

Don't confuse between Testing and QA as both are different

QA is continous process in which we monitors and perform steps in order to improve. It is oriented to PREVENTION.

Testing is done under controlled conditions in order to find defects. It is oriented to DETECTION.