Classroom Action Research is a process for teachers to reflect on their own teaching practice by collecting and analyzing information from their classroom, such as from teacher diaries, peer observations, and student feedback. The process involves planning how to observe one's own teaching, acting by implementing the planned scenario, observing the results, and then reflecting again to determine if further cycles of changes are needed or if the process should stop. The goal is to reflect on and improve teaching to increase student understanding and engagement.