Can testing prove that the software is free from defects?

Introduction

Software testing is one of the fundamental elements of software development process that can ensure increased reliability and improved quality of products. Among the different purposes of testing one can find: identifying defects, building confidence in the quality of the software, delivering the information needed to make decisions or prevent the creation of defects [ISTQB, 2011, p.13]. However, is it possible that testing can prove that the software is free from defects? Do long hours verification of software, or checking all possible combinations of data inputs and initial conditions give confidence that there are no errors in it? 

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