Grades are a system used to evaluate a student's performance in school. They typically range from A to F, with A being the highest and F indicating failure. Grades help teachers assess how well students understand the material and can influence their future educational opportunities. Grades can be based on various assessments, including tests, quizzes, homework, and projects. Each school may have its own grading scale, and some may use a point system or letter grades. Additionally, grades can impact a student's GPA (Grade Point Average), which is often considered in college admissions and scholarship applications.