The document discusses cohesion in English. It defines cohesion as the semantic relations between elements in a text that give the text unity and allow it to be interpreted. There are various types of cohesive devices, including reference, substitution, ellipsis, conjunction, and lexical cohesion. Reference involves using an element in the text to refer to something already mentioned. Personal reference uses pronouns to refer to people, demonstrative reference uses words like this and that, and comparative reference involves comparisons. Together, cohesive devices help create the texture and cohesion of a text.