Promotion by means of an argument and demonstration WordNet 3.0 & Open English WordNet

As a selling technique, a sales presentation or sales pitch is a line of talk that attempts to persuade someone or something, with a planned sales presentation strategy of a product or service designed to initiate and close a sale of the product or service. Wikipedia

A line of talk that attempts to persuade someone or something Wikipedia Disambiguation

Line of talk to persuade someone to buy something Wikidata

Talk or demonstrations intended to persuade a consumer to make a purchase, especially when vigorously delivered or exaggerated. Wiktionary

Presentation to persuade a customer. Wiktionary (translation)