<em>A </em><em>thesis </em><em>is the main idea a writer discusses in an essay.</em>
Explanation:
A <u>thesis</u> is an idea or theory expressed as a statement that the writer of an essay discusses in a logical way throughout his or her research. This <u>thesis </u>usually contains the writer insight or viewpoint, so that the reader understand the main idea of the essay, and is then supported by evidence and data.
