There are different types of online assessment. Online assessment is used in different working areas and all of them have their own goal to achieve. The working area that I will highlight is the educational working area. Educational assessment is the systematic process of documenting and using empirical data on the knowledge, skills, attitudes and beliefs. By taking the assessment, teachers try to improve student learning.
Assessment can be focused on the individual learner or all individuals together, like the whole class, an institution or specific program. Formative assessment will give you an overview of your students in the beginning of your instruction. It gives you the opportunity to still have the chance to improve your instruction. Summative will give you the outcome of the whole instruction.
Read more about the importance of assessments and the Advantages and disadvantages of online assessments.