what is a thesis

A thesis statement is a sentence that states the topic and purpose of your paper. A good thesis statement will direct the structure of your essay and will allow your reader to understand the ideas you will discuss within your paper.
Your thesis should be stated somewhere in the opening paragraphs of your paper, most often as the last sentence of the introduction. Often, a thesis will be one sentence, but for complex subjects, you may find it more effective to break the thesis statement into two sentences.

Source: Writing Guide for Philosophy. George Mason University.
Since the rest of your paper will be spent defending your thesis–offering support for the thesis and reasons why criticism of the thesis may not be valid–it’s crucial that you develop a strong thesis.

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Refences:

http://libguides.lvc.edu/c.php?g=333806&p=2245962
http://www.masterclass.com/articles/how-to-write-a-strong-thesis-statement
http://oatd.org/