The document discusses cohesive devices and their functions. It defines cohesive devices as conjunctions and other words that link sentences and ideas. It explains that cohesive devices establish relationships between sentences to convey meaning in a precise way. Some key relationships discussed include cumulative, adversative, disjunctive, illative, causal, conditional, and temporal. The document provides examples of different types of cohesive devices like coordinating conjunctions, correlative conjunctions, and subordinating conjunctions. It also discusses how cohesive devices can link only two ideas or multiple ideas.