This document discusses sub-products in the information technology and engineering field. It provides examples of key sub-products like telecommunications, web apps, mobile apps, and gaming. For each sub-product it gives the typical job descriptions and backgrounds of experts. It also discusses how expert profiles are selected and matched to jobs. The document then covers similar topics for the marketing field, identifying common job descriptions, managing expectations for marketing experts, and developing a sales strategy for the Youth Global Internship Program's marketing sub-product.