This document discusses the different types of links that are used in academic texts to connect ideas and sentences. There are four main types of links: reference, where words like pronouns refer to other parts of the text; conjunction, which shows relationships between clauses; ellipsis and substitution, where parts of sentences are omitted but understood; and lexical cohesion, where vocabulary relates different parts of the text through synonyms, repetition, or other semantic relationships. Understanding these links that connect ideas is important for comprehending the overall structure and meaning of a text.