Reflection refers to an act of engaging or looking back at a decision or an activity considering how to improve or it formed in one's life. It helps in establishing values, goals when written with self-awareness and honesty.
Reflective essays help in giving the account of personal experience, which enables to analyze one's thoughts and actions and the consequences attached to it.
Therefore, the purpose of writing a reflective essay is to share a personal experience and analyze its impact on the writer's life.