What is the primary function of a thesis statement in an essay?

A thesis statement serves as the backbone of an essay, articulating the central argument or claim that the writer intends to support throughout the piece. Its primary function is to provide clarity and direction, guiding readers on what to expect from the essay by outlining the writer's stance on a specific issue or topic. A well-crafted thesis statement not only states the main point but also often hints at the supporting arguments that will be elaborated on in the body of the essay.

In contrast, summarization of points occurs at the end of an essay and does not fulfill the role of a thesis statement; listing sources pertains to academic honesty and reference, which is a separate aspect of essay writing; and anecdotal content, while it can engage readers, does not replace the need for a clear and specific thesis that establishes the primary argument the essay will develop.