BASE is a data consistency model, and stands for Basic Availability Soft-state and Eventual Consistency. The BASE model states that databases will ensure availability of data by spreading and replicating it across the nodes of a database cluster. Basic Availability guarantees the availability of the data. Soft-state implies that the state of the system could change over time. Eventual consistency means the system will eventually become consistent once it stops receiving input. The BASE model is often compared to the ACID model: the BASE model prioritizes availability while the ACID models prioritizes consistency.