WHAT IS IT?
The reputation of your product - and thus your company - is in a great measure dependent on its quality.
This is when testing helps out, which is aimed to confirm the high quality of the software. A legitimate test reduces the overall level of risk in the system.
When implementing your new product on the market you need to take into account the level of technical and business risk for the product and the project as a whole, as well as the constraints on time and budget of the project.
Not to mention that the degree of user satisfaction with the product functionality, its reliability, accuracy and safety depend very heavily on software testing as well.