Tests are used to measure an individual's abilities, knowledge, and performance in a given domain. There are different types of tests that use various methods and instruments like multiple choice questions or oral interviews. The purpose of tests is to accurately assess what test takers can do within a particular area, like their language skills and general competencies. Teaching, assessment, and testing are all related, as assessment involves ongoing evaluation of student performance and tests are part of the assessment process used to measure learning objectives.