Existential implicature refers to the implied meaning that arises when a speaker makes a statement that suggests the existence of something without explicitly stating it. This type of implicature is often derived from the use of non-specific quantifiers like 'some' or 'a few,' which can imply that there are other, possibly more significant, instances that are not mentioned. Understanding existential implicature can reveal underlying assumptions and enrich the interpretation of conversational exchanges.