Linking words are used to connect sentences and indicate the relationship between ideas. They can be used to link the flow of ideas, guide the reader through an argument, and connect paragraphs. Some common linking words are "and", "also", "in addition", "as well as", "but", "however", "although", "so", "because", "like", "besides", "due to", and "thanks to". Using linking words correctly is important to avoid changing the meaning or causing confusion.