Unsourced material may be challenged and removed. Essays essay on an interesting book traditionally been sub-classified as formal and informal. The concept of an “essay” has been extended to other mediums beyond writing.
An essay has been defined in a variety of ways. One definition is a “prose composition with a focused subject of discussion” or a “long, systematic discourse”. It is difficult to define the genre into which essays fall. He notes that “the essay is a literary device for saying almost everything about almost anything”, and adds that “by tradition, almost by definition, the essay is a short piece”.