Place refers to the distribution of the product. Key considerations include whether the company will sell the product through a physical storefront, online, or through both distribution channels. When it's sold in a storefront, what kind of physical product placement does it get? When it's sold online, what kind of digital product placement does it get?
^ Porcu, L., del Barrio-Garcia, S., and Kitchen, P.J., "How Integrated Marketing Communications (IMC) works? A theoretical review and an analysis of its main drivers and effects/ ¿Cómo funciona la Comunicación Integrada de Marketing (CIM)? Una revisión teórica y un análisis de sus antecedents Efectos," Comunicación y Sociedad, Vol. XXV, Núm. 1, 2012, pp. 313–48
This refers to how the product gets to the customer; the distribution channels and intermediaries such as wholesalers and retailers who enable customers to access products or services in a convenient manner. This third P has also sometimes been called Place or Placement, referring to the channel by which a product or service is sold (e.g. online vs. retail), which geographic region or industry, to which segment (young adults, families, business people), etc. also referring to how the environment in which the product is sold in can affect sales.  5 Digital Marketing Skills to Master for 2020 & Beyond