The document discusses different grading systems used in education. It defines grading systems as processes that apply standardized measurements to evaluate varying levels of achievement in a course. Grades are typically assigned as letters, ranges of numbers, or percentages. It also defines GPA and CGPA as calculations of grade points earned over time that provide an overall picture of a student's performance. Finally, it outlines several common types of grading systems including percentage, letter, mastery, pass/fail, standards-based, norm-referenced, and narrative grading.