Software testing is an investigation of the code and overall product functionalities of the system done to make sure that a high quality of product is developed. There are various approaches to software development of which the most common approach is normal waterfall model or the SDLC approach.
The normal Software SDLC process includes the following process -
Testing is a very critical part of the sofware development. Be it as small project like development of websites or integration of big systems involving complex datastructures and databases, improper testing or no testing can break the product.
Most of us experience use technology on a day to day basis. We experience lack of proper testing when we see bugs in our daily use of technology when we see messages like - "Link not found", "Improper input" etc when we use websites. These are all results of improper code and lack of testing. Whenever a code is developed for a non-commercial purpose it tends to become raw and untested which results in a software failure. A detailed approach and well defined SDLC cycle is very important when developing a product. There are various ways testing can be performed. Testing can be manual as well as automated.
Although crucial to software quality and widely deployed by programmers and testers, software testing still remains an art, and due to limited understanding of the principles of software. The difficulty in software testing comes from the complexity of software: we can not completely test a program with moderate complexity. Testing is more than debugging a code. The purpose of testing can be quality assurance, verification and validation, or reliability estimation or just a user perspective of usage. Be whatever the purpose of testing is, it should be taken into consideration very seriously.