The main idea and the thesis statement are introduced in the introduction paragraph of an article, or an essay. Hence, it is called the introduction paragraph.
The complete question is: What is the first paragraph of an essay that introduces the main idea of the essay and ends with the thesis statement?
An introduction paragraph is a structure and the format of the essay or the article. It is the first part of the paragraph followed by the body paragraph and the conclusion paragraph.
The introductory paragraph includes the basic and general introduction of the main idea that the writer wants its readers to understand. The introductory paragraph ends with a thesis statement that tells about the topic that will be covered in the body paragraph.
Therefore, the introductory paragraph is the first part.
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