This book focuses on two types of implicature, that is, conventional and conversational implicature, with different definitions and various explanations of both the concepts. Conversational implicature has been studied with respect to related notions such as meaningNN, relevance, presupposition, and entailment and so on. A brief review has been taken of the total signification or communicational content of an utterance. Grice's theory of implicature has been reviewed extensively with the cooperative principle, its maxims and sub-maxims. The observance, violation, nonfulfillment and flouting of the maxims, which give rise to implicatures have been illustrated with appropriate instances. Types of conversational implicature such as particularized and generalized conversational implicature have been discussed with suitable examples. Various properties of conversational implicature such as defeasibility, calculability and non-detachability and so on, have been discussed.