Classroom observation involves a person sitting in on class sessions to record both the teacher's practices and student actions. The purposes of observation include providing feedback to teachers and training future teachers. Key aspects to observe include the instructor's words and actions, student engagement, and the interaction between teachers and students. There are different types of observers, including participant observers who interact closely in the classroom, non-participant observers who do not participate but have a planned structured approach, and structured versus non-structured approaches to recording observations.