Answer:
Basically, and essay eleborates on the topic. It eleborates and explains whatever the topic is talking about. Usually, you would give quotes when writing and essay to proove your point. This shows why you chose your answer and how you got your answer.
In your essay an should have an Introduction, Body and Conclusion. And it should be in that order or whoever reads you essay will be confused. When writing and essay you should double check your work. See if you used correct punctuation, If what you wrote makes sence and if the reader will understad what you wrote.
In conslusion, essays show the reader how much you know about what you read. That is why teachers give essays. It shows what you have learned and where you need help.
Hope this helps :)