Communication and hub sites are typically used in communication or intranet type scenarios, where users are likely to be presented with content from across multiple pages and/or sites. Such sites are typically designed so that users can easily get to the content they are looking for. This is typically done through an enriched search experience. Even then, users typically start looking for content using the top navigation. Creating a robust cross-site Global Navigation in such scenarios aides the user experience by helping users quickly browse to the information they are specifically looking for.
