Transitional words and phrases connect sentences and paragraphs to each other. Paragraph transitions suggest a particular relationship between one idea and the next. Within a paragraph, transitions provide coherence: a sense that the paragraph contains one main argument or idea. Between paragraphs, paragraph transitions help with the flow of writing from beginning to end, as well as the sense of the coherence of the whole essay. Transitional words and phrases often occur at the beginning of a sentence and, for more formal writing, transitional expressions are set off with a comma. Some transition words (for example, "too" or "as well") more often occur at the end or even in the middle of a sentence, however.
To improve your writing you need to make sure that your ideas, both in sentences and paragraphs, stick together or have coherence and that the gap between ideas is bridged smoothly. One way to do this is by using transitions - words or phrases or techniques that help bring two ideas together. Transitional words and phrases represent one way of gaining coherence. Certain words help continue an idea, indicate a shift of though or contrast, or sum up a conclusion. Check the following list of words to find those that will pull your sentences and paragraphs together.