The document summarizes a literature review on internal communications. It covers four main topics: employee engagement, leadership and management communication, internal marketing and branding, and technology-enabled communications. For each topic, it defines key concepts, discusses research findings on benefits and drivers, and provides examples. It concludes by recommending directions for further research, such as the relationship between internal branding and employee engagement, measuring the ROI of social media applications, and using blended internal communications to boost engagement.