Transition signals are used to show relationships between ideas and ensure cohesion in writing. There are several types of transition signals, including additive, adversative, causative, and clarifying transitions. Additive transitions show an addition, examples being "moreover" and "furthermore." Adversative transitions show conflict or contradiction, with examples like "however" and "yet." Causative transitions show cause-and-effect relationships, such as "accordingly" and "therefore." Clarifying transitions help explain ideas, like "in other words" and "for instance." Understanding different types of transition signals helps writers structure ideas and ensure coherence.