Cause and effect essays are often assigned in a Composition class. The cause and effect essay explains why something happened. This type of essay focuses on the relationships between events with the consequences that happened. The tone of this type of essay should be more serious and the presentation should be factual and believable. Sources should state facts and evidence supporting the thesis. The essay should present an event, phenomenon, or trend. The degree of explanation of the topic depends on the audience background. The writing should be modulated, reasonable and professional. The thesis should focus on the importance, relevance, or value of the consequences of the event. The cause must lead to the effect. The introduction of a cause and effect essay should explain what the significance of the cause and effect relationship. The conclusion should show the reason for the cause and effect essay supporting the thesis.