The document discusses the concept of coherence in language. It defines coherence as a situation where all parts of something fit together well. Coherence exists in how people interpret and make sense of language, not in the language itself. An example shows that coherence depends on more than just connections between words - it relies on people incorporating their world knowledge and experiences to fill in gaps. Coherence concerns how concepts and relations in a text are accessible and relevant to each other to form a coherent textual world. Major types of relations that contribute to coherence are causality relations like cause-effect and time relations.