Test runs are a type of trial or experiment used to evaluate the performance of a product or system. The term 'test runs' is often used in software development, where it refers to the process of running a program or application to test its functionality and identify any errors. In this context, 'betas' are pre-release versions of software that are made available to a limited number of users for testing purposes. Betas are typically released to the public after the test runs have been completed and any issues have been addressed.