Workday tenant access refers to granting permission for individuals within an organization to access and use the Workday system. It is crucial to establish a structured approach to granting access based on users' roles and responsibilities. Key aspects of Workday tenant access include allowing employees to log in and access personal information, as well as work-related information like submitting time off requests. Ensuring the right level of access for users through proper protocols and permissions empowers employees while also maintaining data security and integrity within the Workday platform.