The Sender Profile is the setting that allows you to configure the From Name, From Email, and Reply Email for a send. This can help identify the line of business sending the message. The Sender Authentication Package is a feature that enables you to use your own domain in your email links, images, and reply addresses. The Brand Builder is a tool that helps you create a consistent look and feel for your emails, landing pages, and microsites. You can learn more about these settings in the Email Creation and Sending module on Trailhead.