Transitions refer to words or phrases that help connect ideas, sentences, and paragraphs smoothly and logically. They play a crucial role in writing by guiding the reader through the text, indicating relationships between ideas, and ensuring that the flow of the essay or passage is coherent and easy to follow.

Examples:

Sentence: The concert was sold out. Therefore, we decided to go to a nearby café instead.

Correct sentence: The transition word "therefore" is used to show a cause-and-effect relationship. "Therefore" is used to indicate that the second part of the sentence is a direct consequence of the first part.