Coherence in writing refers to the logical flow between words, sentences, and paragraphs that allows the reader to easily understand the ideas and main points of the essay. Coherent writing uses devices to connect ideas within each sentence, between sentences, and between paragraphs. Achieving coherence in writing can be done through several methods, including repetition to link ideas, sentences, and paragraphs, using transitional words and phrases, and varying sentence length and structure. Cohesion is also important in achieving coherence, as it smoothens the flow of writing and should be established. Cohesion refers to the linking of ideas within a sentence, the linking of sentences within a paragraph, and the linking between paragraphs. Unity is another key aspect of coherence, which relates to the question of relevance and maintaining the central focus of a single paragraph and throughout the essay. To achieve coherence in writing, it is important to focus on paragraph unity and coherence, express the main idea in the topic sentence, and decide on an order for the sentences that will best develop the paragraphs main idea.