Grammar refers to the set of structural rules that define the composition of phrases, words and clauses in a language. This field involves the use of other disciplines such as morphology, phonology and syntax. It also draws concepts from the fields of pragmatics, phonetics and semantics. This field aims to establish precise scientific theories and frameworks that define the syntactic rules of grammar and their functions. Some of these frameworks are functional grammar, Montague grammar, generative grammar, cognitive grammar, generalized phrase structure grammar, dependency grammar, etc. The field plays an important role in the schooling of children from an early age and through advanced learning. The book studies, analyzes and upholds the pillars of grammar and its utmost significance in language learning. It strives to provide a fair idea about this discipline and to help develop a better understanding of the latest advances within this field. The extensive content of this book provides the readers with a thorough understanding of the subject.