The key function of a Tester is to conduct both manual and automated tests of software products. No matter what company they work for, their ongoing goal is to reduce the number of bugs in software and identify as many mistakes as possible. Testers work in the tech industry, although the type of software they test can vary from organization to organization. For example, a Tester at one company might test mobile apps, while another might test the user interface of a website, while still another might test a streaming service.