A good thesis statement or main idea is the key to a good essay. It is usually one sentence but can be two if necessary, and it is traditionally placed at the very end of your introduction. It is the main thing you are trying to say or argue in your essay, and all of your body paragraphs will go to prove, support and elaborate on it. It is the pin that holds your essay together. A topic is what your essay is about, while a thesis is your stand, your particular, focused statement or argument on that topic, the insight that all of your points come together to show.If you need more information about essay writing you can use any best essay writing company from the online.They will help you to solve your writing problems.