Scheduling emails in Gmail allows users to send messages at a later time, ensuring they are not sent unexpectedly or during odd hours. This feature can be accessed by clicking the down arrow next to the Send button and selecting "Schedule send." Users can also use Zapier to schedule recurring emails, which can be set up with pre-made workflows that automate email sending based on frequency, recipient, and content. Additionally, scheduling emails provides users with a level of control over their communication, allowing them to avoid attaching sensitive documents or sending messages during vacation periods.