Cohesion: Cohesion means the Grammatical and lexical relation that makes the relationship within a test or sentence. It is achieved when writers connect their organized parts with satisfactorily clear and plentiful signals, by using the words ‘firstly’, ‘secondly’, ‘finally,’ ‘thus,’ ‘however, on the other hand, in summary etc. to make the development of their topic comprehensible. It is also used to lead the reader safely along the initial lines of their arguments. It can be defined as the links that hold a text together and give its meaning. It is related to the broader concept of coherence.
There are two main types of cohesion; one is Grammatical, and another is lexical, Grammatical refers to the structural content, and lexical refers to the language content of the piece. A cohesive text may be created in different ways. There are five general categories of cohesive devices that create coherence in texts. The devices are reference, ellipsis, substitution, lexical cohesion and conjunction