Define software testing. explain its types?

Software testing is the process used to measure the quality of developed computer software.

According to definition given by The Institute of Electrical and Electronics Engineers, USA (IEEE) - Software testing is the process of analyzing a software item to detect the differences between existing and required conditions (that is, bugs) and to evaluate the features of the software item

According to the definition given by Dave Gelperin and William C. Hetzel - Software testing can be stated as the process of validating and verifying that a software program/application/product:

1. meets the requirements that guided its design and development

2. works as expected

3. can be implemented with the same characteristics

4. satisfies the needs of stakeholders

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