The Donor Lifecycle is the process that organizations use to manage their relationships with donors. The cycle is divided into three phases: Acquisition, Retention, and Upgrade. In the Acquisition phase, organizations focus on building relationships with potential donors and converting them into active donors. In the Retention phase, organizations work to maintain and strengthen their relationships with existing donors. In the Upgrade phase, organizations focus on upgrading donors to higher giving levels. Each phase of the Donor Lifecycle is important for ensuring the long-term success of an organization's fundraising efforts.