A prospect pool is an organization-defined collection of prospects (candidates not yet attached to a specific job), typically used to manage talent communities and sourcing pipelines. Each pool has its own ordered set of stages (see /v3/prospect_pools/{prospect_pool_id}/stages) that prospects move through, distinct from a job's interview plan. Pools may be restricted to specific departments, offices, or jobs (hiring plans) via department_ids, office_ids, and job_ids; when all three are empty, the pool is available organization-wide.