Is topic sentence and thesis the same thing?

No, a topic sentence and a thesis statement are not the same thing. A topic sentence introduces the main idea of a specific paragraph, guiding the reader on what to expect in that section. In contrast, a thesis statement presents the overarching argument or claim of an entire essay or paper, encapsulating the main point the writer intends to prove or discuss. While both are essential for clarity in writing, they serve different purposes within a text.